Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7f1fee912231e4…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 05:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9f40ad6a08d5aadec2908182e2ebb4cc SHA-1: f67b36acb8577807c390ebc4be84b2cc90ef38c9 SHA-256: 7c7f1fee912231e4e45a1ad3814f028a11d3c74bfe8a09c70d150a9247a364e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm to distribute further malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being detected as a phishing trojan. The primary attack pattern involves luring users to click on these links, which likely lead to malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abf40887e5a---gizirapesixepulibagakuxe.pdf In PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/36629877847.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/7f0v6rlqmgc3q24piu5l9aj1md/95424649300.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ab3029948f95747a5589fa4fa69f99a3/vivumigid.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c50b5793---bukivogixawolumadopibof.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/nolizokifebapikomederev.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077811b2fd07---fozaziwajaro.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/47f8856b22d4bb1c91cb31a2776dbc45/99463708114.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/vufobojinativedip.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c295b31d847---zidusode.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e58584e07f---katitudikazoxef.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/zapimoderamijazoz.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec2d41252---lejini.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b4cd5e4b---rujepopumusegefikizebame.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c020a0aaad9---pumotetanasevukazow.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731fe70c6ff---77151780387.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/312b4fe3bb5deb0dc3ec5e1e4949639f/80311057639.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a50311c6d6c---75084416514.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/wufin.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2823fa6c---8342031333.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d153d03a8---nefofabofavevitajolawijiw.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/9231149519.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/kavugujemebig.pdfIn PDF document text
    • https://led7.ru/file/semumumanotevorumaxasud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=research+article+review+formatPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10692 bytes
SHA-256: 36f9d5fcef1d6e63c924152bbdee5a6751e2318012ee473a89547cc71a54e743
font_01_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 17036 bytes
SHA-256: 3683d703f584117ffd54e5454e20815839dbf97b8a4e8a810a057b6f946687d4
font_02_sfnt_off000138e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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