Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acce8b8641dc511…

MALICIOUS

PDF

86.0 KB Created: 2021-07-01 17:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de784e0e3a011ad03b024826fc9a5185 SHA-1: 2c285221d01dee02385a61546c1495ca673478d9 SHA-256: 2acce8b8641dc51166736c204b9975db168a65b4f11cf5545de1907305d932a1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://msslink.ru/userfiles/files/latewedowixidobeg.pdf
    • http://allycatering.com/userfiles/rupugebalikuwotonekavazuf.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160831979dd8c9---23940321857.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609576218ca23---19981784783.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f443a84ba9ced488ee5a4baa0cd39d6c/sizojelinur.pdf
    • http://msamerica.net/clients/873634/File/17998436634.pdf
    • https://muratay.nl/userfiles/file/mawotikogotubavuxudol.pdf
    • http://akcjonariusz.com/UserFiles/file/88734272780.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842cd0035e---sukejuwujobepuxatelisedo.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69062f5f0---kubobaxuzemitomes.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a26384ee---faxopokejuwawabezafidoren.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/zozoxazari.pdf
    • http://erex.hu/upload/file/30445668779.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1ee00316562d373d39581486af40abb2/razopup.pdf
    • http://jun-travel.com/userfiles/file/44836676097.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ddf425dd2---75952361929.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160768ff52404b---55814651347.pdf
    • http://botosani.ro/img/uploads/file/61701704383.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/fapijojisakipexojogimavan.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d6bb75a8---62702393940.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h8rd38a9iqj3i4hamm5u3jmn2c/sefoxajutamamapuvob.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4839f0061---30545250724.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bs8952qgvc77tuem153uvqsi5p/dezibipezokowo.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c7d615b181a42bd15ee338ff59b045ad/9979659072.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+elder+scrolls+v+skyrim+system+requirements+pc
    • 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_off0000ec00.bin
bde5c626c5a52b54d7a1bc8a04114906e8b9cacf07a2daad977bd73cd2b4aac2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 17136 bytes
font_01_sfnt_off000118db.bin
6061d8d5a5ffc59fa779aace32507bc8813765a732696232c58d23f15ec15e27
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 11096 bytes
font_02_sfnt_off00013267.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13267 16792 bytes