Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1799d9eb0d9a85…

MALICIOUS

PDF

102.6 KB Created: 2021-07-21 21:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 053bc7b035012ed9861e0ea04f0ac017 SHA-1: 4314517db82ae9aaf22ba558fa57fca7447bd5ae SHA-256: 8d1799d9eb0d9a85664cbbe251275a94857218ca8746810bbeb7c8e00a2afbf7
176 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 WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195e15266d---8024256113.pdf
    • https://anukulagrotech.com/ci/userfiles/files/fexipafitug.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/sixafakenoxotegivumesagis.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cd7b38fe---25278514924.pdf
    • http://chinalanpa.com/images/upload/File/13165927335.pdf
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/pazefete.pdf
    • https://jetaime-shop.com/files/xobixadabidizep.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160833e5765609---1850482843.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/67652123324.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10e1a7570---3198879714.pdf
    • https://alshaabcoop.com/userfiles/file/pujof.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7mb6892su67bdeh7epdhlbe970/gezezidijugufe.pdf
    • http://dynamicyunnan.com/ckfinder/userfiles/files/sokusademori.pdf
    • http://etcad.net/np/upfile/file/10670866269.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d94ce6714---76155921833.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/948u9051j1h1833s6cqq44jqrq/fawur.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/471a36fba8a30f03e41eac3d2eceef92/76157036233.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/92d6f6666037199bd03958783c4cbf42/38345549997.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b61eb83aa02---xufowowadadezivupule.pdf
    • https://alate.org/admin/fckeditor/editorfile/58815218196.pdf
    • http://poltinka.ru/userfiles/file/93324714150.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483496aa67---sowewofenik.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f0e223d5---14702226627.pdf
    • http://jlm-kg.com/uploads/file/72862371946.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=class+10+chapter+life+processes+notes
    • 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_off00012f99.bin
3ce59ddd0c1417e94a7c31369a4fff28e3abbcc82d9ebbd1d18606f74acf40e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F99 10784 bytes
font_01_sfnt_off0001486f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1486F 16792 bytes
font_02_sfnt_off00016081.bin
3432f92c427b1b99787cf02ddb53dc2d61c97717f1a96b6ca0ae333fae43e1ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x16081 16852 bytes