Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a885e7ab8085a3a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 23:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6748445dd26757e55714f1bb888c0b4c SHA-1: 582b88a2869d73411456a1abaeca6960db4659f3 SHA-256: 3a885e7ab8085a3a4c4d7cfec572dc47cf3bd00052ab2249678d1c08a2389f70
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://identik.hu/editor_up/tanixilovofew.pdf In PDF document text
    • https://hamasataccessories.com/userfiles/files/8219855658.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/2sb8ipfolei4o66pcige4ir57h/25515467553.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078091c6fcc3---pijezolekega.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/nibudadelirefipaku.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/35047197747.pdfIn PDF document text
    • https://coil.hk/upload/files/53589861767.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/33117626196.pdfIn PDF document text
    • https://kueapem.com/contents//files/55535234668.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/51426779691.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb445c83a---58162195623.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292f2738ee1---16984367970.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/16/file/20210516_154308_148.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609800a753063---zepubaneze.pdfIn PDF document text
    • http://minhanh.com/files/13878934571.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062303145473499.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b218ea44c---zebowopakufiwiw.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/depawepunibejevumiweg.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/jepufaporomifasufuwa.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/4303166628.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/83497522139.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d65dd9df478---14020793936.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610600b3ba343---74261585831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=episioplasty+in+dogsPDF link annotation
    • 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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 10432 bytes
SHA-256: 4345b1b889711dbbf9314e862891ddceb192a93445d677ddceecf1f336b3fdea
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 17028 bytes
SHA-256: abad70629007f7c153563cba5e54ba8ea2d92a172bdb8c9f8c43ae664e2679b7
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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