Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b4ae0d58ce0a6d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 22:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efb1e3ba6e1f134b0224e47acd1f58d1 SHA-1: 0526d2286467e74b31143f576dc00d4dbf462786 SHA-256: d7b4ae0d58ce0a6df421a263dbd2affebf93b8ba276a7423a3e654aa2f385f07
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The embedded URLs and the document's structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=pokemon+tower+defense+site
    • http://tsrmvolontari.it/userfiles/files/puvubosabixeziju.pdf
    • https://value.ae/userfiles/file/65547545078.pdf
    • http://myhomeinparis.com/userfiles/files/tefenopumafu.pdf
    • http://vinacafe-dalat.com/Images_upload/files/lusonopubarubazelidafima.pdf
    • http://arredamentoambienti.it/img/file/gavadozuxivawagoburaz.pdf
    • http://cdkuys.handysociality.com/upload/files/ruxosamunazofusawowotazoz.pdf
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/tuvosubosojedaran.pdf
    • http://younewstoday.com/task/userimages/file/duzofijeteru.pdf
    • http://reklama-kemerovo.ru/files/files/tupesetomoworanulun.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd3a0779b---fibabuvotol.pdf
    • https://gadd-asso.org/userfiles/file/popigexiwemelibinajapejes.pdf
    • http://skogsformedling.se/bilder_umeny/File/nosidasolutijupazakefa.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334119074c4---26751788771.pdf
    • http://mmsmarin.com/imgimage/file/78058238254.pdf
    • http://ilturismoinitalia.it/userfiles/files/golijejunuraderatevusalis.pdf
    • https://artgreen.vn/attachment/files/59981371567.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/luwibuvujalakigimolidip.pdf
    • http://darec.sk/files/files/bagelifufudabosaxirisu.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210907_182252.pdf
    • https://arvikabc.com/images/uploadedimages/file/ripatodofagoso.pdf
    • http://wish-pharma.com/upload/files/232853570.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/39f4md0suih5j0ebrj8ng2p545/64354103362.pdf
    • https://iveducentar.com/uploads/assets/file/jofeteburosux.pdf
    • http://t-eamplus.de/web/editor/files/bilexamuvixi.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca1f86746---xejus.pdf
    • https://berbagiangka.com/contents/files/30404141066.pdf
    • http://wo-kop.pl/userfiles/file/lutavaxasezaxomaweta.pdf
    • 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_off0000b5d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 16792 bytes
font_01_sfnt_off0000cde2.bin
1eb5aeb3d2c1d047b4f76514d4768fe90fdabd8a3ee2122a6fcb3ac959f37ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 15700 bytes
font_02_sfnt_off0000f56d.bin
3ce27ab4a5170548b079b02f2bfc31e740e2aeb299350c683c5ab31719f1d02b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 10484 bytes