Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80834cac5315b80…

MALICIOUS

PDF

70.0 KB Created: 2021-05-12 10:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34f96eacd498719e236498c7f7488bd0 SHA-1: d5b006f94d79cb83a2b0053419e8721a4b19c646 SHA-256: e80834cac5315b80ec0efa1aa30779400c90c2b771cae915167bf051bb623609
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of these compromised CMS upload links and the overall structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d555c7b236---5170546153.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/irbgbr989tl2tt909mprr63c38/bujetiworezabomor.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0oqmds7bs3eg743cur2q0m9hs5/60425927844.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/5b2e48f8b9135f47eb3381a6b72f49a0/84512129017.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/42c1f13585e0010da06b447a86fa8f83/dolididesipidumodepujumup.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/obotselsosuhnkjjceisdebj8g/negiminesomedavimalovadi.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b204bab6ce---kajuxak.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/bf56e425f7eacbe118bce71748e19abc/menezivolosase.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160828320912d0---17051700981.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712a58a64cc---rasonisixidukera.pdf
    • https://batikatravels.com/userfiles/file/67483816983.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qr6q1hgd4p2q6boakp4t4bu19u/faxagenigifud.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eve9fnbtrukkr3fj6rrmdsctq6/zibibides.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098897c8594c---xazilu.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k3aijnh30775o6l55mfh7k5agj/94572129487.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=canonical+name+format
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d735.bin
499a35ff3ab745a3ed454e1455df9ba0b03a080a5728317b828379ea85f14c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 4752 bytes
font_01_sfnt_off0000e747.bin
1209b391016870cb4cdf9b7f2e1a5a46fd9cb81fe300d5706eb374ae85b36a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 10404 bytes

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