Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e0ac1575e6b8bb…

MALICIOUS

PDF

109.6 KB Created: 2021-06-26 11:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bf1271e5c36fbd67f209c59a110beb9 SHA-1: eabd8b039a0694cc1c89a19f7e47d6f6961c85b1 SHA-256: 22e0ac1575e6b8bb53431befc2e611ca0d3922f140af29b7b22edf8ff3a89563
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c975298def---rukegexosi.pdf
    • http://schokobrunnen.com/idata/56013014306.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16098aac5de1e4---pefevogifofabujozimowato.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d91edf8f0ae0d0a03538529b3a364901/12045807674.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3d0a4fbf0948edfe75c9032619c67338/sudavuvuro.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8d8f0b6d---83938728585.pdf
    • http://c2r-auto.com/uploadfiles/file/2021053016473673499.pdf
    • https://parfumzone.ro/files/file/80747360457.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df7d2040c29f71df76af17993d67ca44/64720580021.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qr4repgims4e44gd5d3g2mv7e7/33534570338.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd604617fd---69278506443.pdf
    • http://arch-teh.com/pic/userfile/38930780447.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077f6ea18f91---dedizusegoguwavo.pdf
    • http://tourister.kr/userfiles/file/xadidipabonozebolufa.pdf
    • http://studioboscono.it/userfiles/files/fenuvazivakamupenosomuda.pdf
    • http://wojno-stal.pl/pliki/file/47841668341.pdf
    • http://ankaser.com/userfiles/file/30872796997.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b0468f85---kegojuwujezowedefu.pdf
    • http://verkaufs-akademie.com/userfiles/file/jufofovadagibapapiju.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d469c25825c---72747386758.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5f1e490872b3167c1d9ae71b1b9b07e4/36592374258.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fa0b35b5---86974200259.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c72a5f79e54a24b86ddc4a2312ff393c/53981476711.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8accc6033---64863914050.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+underline
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011bb6.bin
35ef6045a6afe9235a95465496c37347bbfe18f25929dc1b05e15546915d6ebf
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11BB6 23108 bytes
font_00_sfnt_off0000f481.bin
2904d5f2af4b8b7ef320c8b8344ea42398c901ad9230d4551c944ebc85cdf080
pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 10356 bytes
font_01_sfnt_off00010bb4.bin
e468d4fe14d760804e869a9a3082e76a5f889212faa519e4c0f17044da1eb3ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 4352 bytes
font_03_sfnt_off0001464b.bin
762985e61c28b55914a237af358a4a68ef77eb5a0495e99f0d3ad9bc4dbb0af5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1464B 29660 bytes
font_04_sfnt_off00018e9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E9D 16792 bytes