Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61e2d4edb387b5e…

MALICIOUS

PDF

105.6 KB Created: 2021-09-01 18:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cf9055fe7e1f4af538764de567baf73 SHA-1: 32c551b93bfb2fb8e0de5318c7c93d93d9786b67 SHA-256: b61e2d4edb387b5e3536cea1fa16b2a2c7e1e0c8b27d526e100c39e8a9588eb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as redirects to phishing pages or malware download sites, consistent with a spearphishing attachment attack vector. No scripts were extracted, but the heuristic findings strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://philabc.ru/uplcv?utm_term=long+day%27s+journey+into+the+night+pdf PDF link annotation
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc21cdb2c68---63672899060.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4557bd0f3---tudejen.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/45309128396.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/29699457667.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073e23a43903---kupejatod.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/marokubuzapinigiwebinofaz.pdfIn PDF document text
    • http://farmina.ru/uploads/files/wedenasinenomimef.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fed39ac05---2852081188.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/xegibozapagago.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abb567e712e---90060653813.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/miwofopeboremanojiv.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105240937421539.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/59797537423.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cn0crrfushs4qjibn9dmsrc5gj/42086910953.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/19201171604.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/58185501724.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/71370888024.pdfIn PDF document text
    • http://didula.com/img/file/paziwoxotodigabiri.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/funiwitaruvuro.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/99007bb5a9241f4e9d15a5e23fda3ba6/desevedewako.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fa8a2b4660da7ee00f18889bb7e279c9/97185781156.pdfIn PDF document text
    • http://17njl.com/userfiles/files/43632782918.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d21ac4f67---47021154448.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_off00013541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13541 19368 bytes
SHA-256: ffe27e83de502ffeff7f3429f1cf70789841b148730005cfce50551b8d954b58
font_01_sfnt_off00016777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16777 11068 bytes
SHA-256: 1dabad3e6d42b5e8aee6b4999f275f09cc04716680fde1159ac2796fcf5211ac
font_02_sfnt_off0001810b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1810B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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