Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87d86b2ec9164d0…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 15:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62dbd69447bf3bd44b8700009f9654e7 SHA-1: 8907da3efc476c80d4e78f78034ad404f8ea6969 SHA-256: d87d86b2ec9164d0e5942a58e6fd88bf5539f3dac1a9394e680948ee985f53f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://pampa.be/uploads/userfiles/files/rijibanatisu.pdf
    • http://www.bandungmesin.com/file/45366898324.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/71781360860.pdf
    • http://cortabellanews.com/userimages/59523369937.pdf
    • http://gld-lining.com/user_img/files/92964629349.pdf
    • https://manenshop.com/upload/files/39435610546.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33b3b6641b---38710308112.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/bitafawu.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/jfkbckt57q8n99jo1t5ukbbqp3/tobisisufevifu.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5glieqh4p5kr97f4tjs1f0cap0/kijavu.pdf
    • https://kalashad.com/userfiles/file/vesusejowe.pdf
    • https://botorka.ro/userfiles/file/80870689280.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161219ebe361e3---nibigasudogowonavo.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/24cd1897d838c955d52e73b96a351a61/60682032901.pdf
    • http://valdhans.cz/userfiles/file/47467554980.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/3bb9np3m2017utgmp5d18f2p7i/vuxusukivakiratonid.pdf
    • https://paidionresearch.com/userfiles/files/65375980298.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6df580f4---24475165340.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16074487718c64---dazesavela.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d7c7c4fc99cd6fde56defaf4dcad3271/niwaweledom.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e8743dd1ab890efec974cd30c052eb80/wufedivoxefanozufimoram.pdf
    • http://4bx.pl/public/file/55552535702.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/letotipadejokekoredagexux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pdf+split+program
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bed8.bin
053c662e96ead56ae692668a4b640c7d38c457bfa342d6d81e4c6e2335e65982
pdf-font-stream PDF embedded font (sfnt) at offset 0xBED8 10604 bytes
font_01_sfnt_off0000d6d7.bin
3ef5fc5e248e5347553574bf42f58de4a8a3f0dfda2eea6879a062224c7db63d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 16788 bytes
font_02_sfnt_off00010273.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 16792 bytes