Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bb12e46591f54d…

MALICIOUS

PDF

94.7 KB Created: 2021-08-15 00:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7dad80826deaa8fd2df23dfed1c9893b SHA-1: 6429004342ebc0405a970e349c621c48ccea5689 SHA-256: f5bb12e46591f54d88e799b4f4ea5507d5cc7cc452e0fede016d9669c6a28b4d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=flight+sherman+alexie+chapter+summary PDF link annotation
    • https://marcuspietrek.de/MARCUS/files/file/72127498394.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/t2jg8p2h4gco28si5ekrlpspl0/nesobew.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/sudonok.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/9snqf0maua6mkar4p1f3p36tti/tevaxebesit.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/tesesas.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/tugokanexixireko.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/08b0te6vvsd8d26se1ra7stego/roradudunagimikar.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/nudexokovuw.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b35ba8c9---93086391688.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/kapunigimujunezozav.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe51bb775---lusotukol.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b6fae607e---44957074864.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/dupolifepa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/66sr2g0kq9p4rbbdm7jcv1ve82/ranujijuxokoj.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/33f06c4c84a9baf655544bf0b6ba50a4/xupolufujijiwazudaridod.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/526dff370485714309a9fe0ebba2b16f/55729106619.pdfIn PDF document text
    • https://ksboutlet.com/file/files/zedipukuvakebifi.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/rejuxodevenobunivuve.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/43722919056.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/mutufinoboxisetig.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c294b5dd08---45217291417.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/519a2564b5bdf7947126809151efba60/noliwosiguwuxubevinem.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/dj1o2jm51qdqgdh3h82dodpgt1/dawomajebipik.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/majuzanifatafobegemogeza.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_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 16440 bytes
SHA-256: d06f746eb12ed69068b29100e9b701d96a46b1961b1b7c8404e50e02fb4d2d49
font_02_sfnt_off00015217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15217 10992 bytes
SHA-256: 87ddd461a2eb2155cc6f207bd925ce000bd1e8782fc02e26c52cb1db3f7912a1

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