Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6913fcdb168598d…

MALICIOUS

PDF

93.8 KB Created: 2021-07-03 12:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 52d1bb662c69d84597a14fd65d713d2a SHA-1: 9b880cfc1801807e7a09772c089bd8bbb101b59f SHA-256: d6913fcdb168598d296a4ce5e06d62a7091583634488f912abd805f89814a5af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://archism.ru/uplcv?utm_term=tallest+waterfall+in+ohio PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4b01e0e5---12938272135.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/96498301230.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/71115349371.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/raruk.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zesekofusu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9ognj5io9l2ga8ecvfsl96ne06/linezajijevod.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/69864804359.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/sujokefeko.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/dixefunuveze.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6d70417860703278cc0b9fefa84bc77c/36794340492.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d8634d35fe9c666050f0a29255d8c4d7/22402589179.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071408eac144---63417654231.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b93195d67d---dolemanifusi.pdfIn PDF document text
    • http://mousike.it/img_ins/files/60630708377.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jr7hjgsunn9g96bf7og17pc90f/3602024715.pdfIn PDF document text
    • http://eibich.de/layout/bilder/file/ladex.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd07ec69e8---gadevitemodutiwafu.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/94849827708.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7ef1f66b9bd6c66a77f8682c4d26e109/59216897951.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/49298554523.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/jqfvagsn2henakrj2uk0m0i307/fiduwamubaxad.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/62054184628.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a05974bcc---mopekixijetika.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086de5c81e00---piwifidodovimabofol.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_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 17324 bytes
SHA-256: 8a852617f87adfaffd2efd6924b816b4ef3cf750747232f72ee6585025c10fe0
font_02_sfnt_off0001528b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528B 10360 bytes
SHA-256: 1ea41803551dab5aa3edd1adad17ac144050dedb5f47fa034ec7222e94d785a8