Malicious PDF — malware analysis report

Static analysis result for SHA-256 760d7350052fc157…

MALICIOUS

PDF

89.6 KB Created: 2021-08-20 08:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 92bd907ba2b409bf971afcec3b030302 SHA-1: 03fc673445b92c5defd676d2dd42cf7105e0bc08 SHA-256: 760d7350052fc157d37a075ba67e42ff093fc8bf5544dde4a65de53d09b2eb93
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 files hosted on compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and URL analysis are sufficient to infer a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://peoplehelppeople.net/uploads/File/goteze.pdf In PDF document text
    • http://studiopignotti.it/userfiles/files/5289490494.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/jowupamewolotexen.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/09f3d250132c96e68e3f42b525f71196/38642334716.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8ff33b32---seriwuvifarusubopalubevag.pdfIn PDF document text
    • https://slide-bearing.com/d/files/fopagosubogejawew.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607019cc3b525---81646527102.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df888f87b---zaziliz.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/4480293290.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/61459000757.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ec6731eafcb68dc8444d6994499e09ab/1236181981.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/416b067497c25177ab54c028ee09ba75/gifedolavegadivos.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/sanaredobeg.pdfIn PDF document text
    • http://garderoba.sk/images/_file/podujif.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/92716192854.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/31421153546.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d60acb56e4122873caf8eadbd25ae4e5/10863597102.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/ziweronuxuse.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be44ff53ecc---zusomepamixigusuxewa.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/bff81ae347393c70d5bbe63e17e1f6eb/21328264663.pdfIn PDF document text
    • http://prestopc.it/upload/file/tuwededufefevuvabon.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a2f8f452013e08d7169fe99d539a6e29/62235479218.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160953322f173f---lavosafazutevudukoderon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=imprest+system+of+petty+cash+book+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10948 bytes
SHA-256: 0eb30478b53a2fa1d5ecf79b60f6a6e2acf7f9b1548caf2e3f6537ad13f91d5d
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 17884 bytes
SHA-256: 10dccb3cdd4b6046cb2604b60ca8c49d6bd1a5eacf3c648681b67fc6aba6d321
font_03_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 16760 bytes
SHA-256: 6b6666a82d9455d44b876e073968b8e7b585a2d150b4c34bdcc46074d6b98a8c

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