Malicious PDF — malware analysis report

Static analysis result for SHA-256 add1960c496db67f…

MALICIOUS

PDF

78.3 KB Created: 2021-06-27 06:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ad9687e4492b5822f7db7a04bb0124d SHA-1: f0b89278af7ff7cf97691cf833498d72705f3f46 SHA-256: add1960c496db67fde591bf23a7e7c9d47372574b445f26b4d122ef0115303b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to a malicious second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a69b3b61549b4f76d36f731222bfd81/sodazef.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8534998a---viwobonajodigajebixemabi.pdf
    • http://linuxnewyork.com/draft/media//55048099476.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3faad5d7fd---jowupumisovenem.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/42986444445.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099df25ebcad---tirabulog.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/b36148cc6d5477c367faf1e8a6c201d5/57175251816.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e2311281903b6e3616b0858ababf60fd/48522912563.pdf
    • http://sola-brothers.com/userfiles/file/92726007120.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743b07b3285---7898524965.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb00001275---goxigikonoma.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b80fe6ca7ccdb494dc304bb716601ff9/tagirijululo.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r3rc95qjl4d02qm7lhk5llk1l3/zunujujovirefuliv.pdf
    • http://guides2alpes.fr/uploads/file/13983686895.pdf
    • https://poolpoint.be/uploads/file/18889080088.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ede6d5db---18914405144.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085981e576ca---91463072111.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb32d62d76e---39156596066.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02942e8db2---10880034486.pdf
    • http://beiks.info/public/file/lufogabodipanemubijunimuj.pdf
    • https://nguyenthelong.net/userfiles/files/39713770288.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70cb19efc---vibenirodid.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/4m561vkd0b4j18mkak230f4f10/24992699454.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=absolute+value+expressions+worksheet
    • 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_off0000cc8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 16792 bytes
font_01_sfnt_off0000e4a1.bin
b5f2184d74967f9dc597f384a2b61c381a0755101fac7a5371ae6e92dfe34e9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 16868 bytes
font_02_sfnt_off000110e3.bin
0a8f7d65fbe058fd5dd12f866dea178f25cd12bd1776a74a4b5604bcb34f4268
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 10916 bytes