Malicious PDF — malware analysis report

Static analysis result for SHA-256 3feff09a09e0662b…

MALICIOUS

PDF

94.1 KB Created: 2021-07-08 08:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b12f9158f6ed0542939ffc3fa81fb2a SHA-1: 56a9e47fbac02e2316ba1cde1ab5a6d007dc9e93 SHA-256: 3feff09a09e0662b38ba3f0463f910ee2f85be979fe08b58835f8ff2b5f82d6e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or redirection strategy. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly suggests malicious intent. The primary attack pattern involves directing users to potentially malicious external sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=owning+a+bull+terrier
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb5a13491---lujusuzebidikujo.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429064350132397.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jk6hf7i0tcbq7vpi2063kkpsao/saxatok.pdf
    • http://kccmaul.com/files/files/14012246162.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65103c9e4d---22898810282.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/2678962534.pdf
    • http://jingtianlawfirm.com/images/uploadfile/files/22266426209.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/46daa97e04b569a1df9b3b6cbfd45dd3/6893961432.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090801998469---21990077859.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a177f65f69---dazotab.pdf
    • https://camgloberealtor.com/userfiles/file/tipet.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb82384fbd---82417064502.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1004edaf9f---93491950505.pdf
    • https://polnische-zaune.de/userfiles/file/4562975306.pdf
    • http://uci.ir/userfiles/file/wejetazukesum.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607986fa7365c---gigewibiwosakizilib.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2377ec8027---16773335579.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210604030536.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8705ba271a---penikiwovavavotu.pdf
    • http://mindatpeace.us/uploads/files/pejafideto.pdf
    • http://ty-universe.com/image/files/20210610_222124.pdf
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/jakufovekuru.pdf
    • https://dalton-english.com/userfiles/file/kijewimedevoxidebulitixof.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e50e2ecb---fugapox.pdf
    • 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_off00010d5a.bin
171762024b0a9394d9f53c266bed40338c18b1942c84882a10030a69184735cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 10348 bytes
font_01_sfnt_off000124fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
font_02_sfnt_off00013d0d.bin
3bc7fe9ad8bbefed14bfcc30099c0fd13c936e9f6b31cfa4e3be7e1e63f16ca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 17640 bytes