Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d892e527b912fa…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 19:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1271361d3618fa8ee6a03c79e1f2fd5c SHA-1: b0a54006e34f5ab094e6340b9ce90ffb87957f78 SHA-256: f7d892e527b912fab333c97ec469340fcaad91dcac7332cf7b16be144516ffac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to compromised WordPress upload storage and other disposable hosting sites, suggesting it is part of a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users with a seemingly legitimate document, likely a manual, to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/75d46sk23f9auj7r0h6f7k0fpp/77008569761.pdf In PDF document text
    • http://denprokhorov.ru/images/file/lajimamevebafelakojoded.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4556945294---72106265066.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8f19dd1c---59272204793.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/rozoxidur.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f748ef3a---fozulolijanemokub.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c4c26346---wiliwokemelumulomutowifuf.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ea33bf366d46dba138408a2b1d1a87fb/79084488373.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/37526815854.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125d3d2c0efd---tifofevixukujiwazupebek.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2a131e6551ec24bdb88741142f07b3fb/valek.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f2d65604a0c755071ee2ba315a083604/tosar.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a117286f62---67194607135.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///69735602354.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099cab634252---34342462403.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6be08bda1---24081876750.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc80117b1a---fuvuvemosavez.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/11278899207.pdfIn PDF document text
    • http://ud2-140.com/files/baruluxorubadisefuse.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lizegakefatofuxozaf.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7bab4095637162a7d4eb37c01ed6f2e8/68933994191.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/tuwekaridevifejivi.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/ginonevimekuzowibidud.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608d40a56733e---kafajoxevarewepuliwazoner.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611127264ab8a---95785921783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=subaru+outback+2020+owner%27s+manualPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/26144296995.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 11068 bytes
SHA-256: 58fe45bdfba4d17ca7b4514db507885a8b1c745563909aa8b127f18bd1c84b3c
font_01_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 17668 bytes
SHA-256: 13ae61b7b1c0c30557ab6c77efb164d8cac2aab1805f2e45ecd8bf25257baaf1

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