Malicious PDF — malware analysis report

Static analysis result for SHA-256 5396c7429a102901…

MALICIOUS

PDF

96.8 KB Created: 2021-07-10 08:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e897b4d73fd8244053ba401eb74b559 SHA-1: 161f04c336315f5401ac8fa995755b91298bba07 SHA-256: 5396c7429a102901972f08571a01ed5536ddec7038326fd36f155e52980afdfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of numerous external URIs indicate an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=clean+junk+from+my+phone PDF link annotation
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607607fd23e92---zokaxupagenenizuwinujow.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d522bae576---9672483412.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c05206e2ccd7916cdb8c307fc82448f7/55713731210.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/nopibamudotizijok.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6a4gtpnj3bgeum5mk5e3s8lfaq/nofovim.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7648a1d79---80849183556.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/jiwirozidida.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0015620f---fijowirubip.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4f4a25a823a8cb2a44305841a4bc7bd9/jivizusokonige.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cr8elta1e7fjqg01ncfsu0hq53/59717212388.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c82450d4a---jozov.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/bebamibasusixota.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8dbca19e5106345b761f63df0777ffac/zasogux.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0d57821d---bemokarobubedit.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/bisekarajokubukadilojujet.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7183375192---webofofoxopajumipaninuxa.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160714158dd096---63814466320.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a3acc71f0---sogekipasox.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/2ec24113e48c394d4d951737169a179f/82741117315.pdfIn PDF document text
    • http://apcmagon.com/userfiles/kokabuvononizavuwopevag.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqnecfrl4l6jdffhopov3natnd/boxideba.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf6393d38---pinepapoxijufimefetoro.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/42790433089.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/44b576a6b52e06546c8764b28acb9be6/13247739577.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e07e70ad7---66241856074.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65b36010c0---xoxekivipanapefosuw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 10732 bytes
SHA-256: 75edf1d24048e0e7b2d20171e3fe2e62d6bb69205aec0b7bfd9e9bdbce6a3515
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 3012 bytes
SHA-256: f0082e43d490317a04d8a084ecbbf643f3ab2cad85890d7f50f1b11a3f1942bf
font_03_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 21936 bytes
SHA-256: 568183e3e57183f14342a47bbcc76e51e309a5821abec3d691fc80ba64d4d01d
font_04_sfnt_off00015cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1