Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef9407e4a3d763c…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 11:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80630d53a7776bcdcc821efb9d3ff591 SHA-1: 22a7c3d0de113db9113d8ab13c935b142ae46fa2 SHA-256: fef9407e4a3d763cc2cc375efed12407bd4350656d36beb088b25cf1e2b09488
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. While no scripts were explicitly extracted, the nature of the links suggests a potential for JavaScript execution or redirection to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://dichvugiayphep.net/hinhanh_fckeditor/file/waxasaruridevugunadafimo.pdf In PDF document text
    • http://acmemask.com/upfiles/editor/files/50053269287.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/fomimu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be751d79e---44125435062.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f074a53d4f---dipipigokipalirakime.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/20789e3dd95236b81e7ae5c2f8ed8f82/fodiwudiwepovejelezurif.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/sivunezinirixufom.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2c49ea18---levilutu.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d323b6c8a8fa90bbb7792be2bc7a230e.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-19/20210519043033742364.pdfIn PDF document text
    • https://anfauglir.com/images/file/80489946619.pdfIn PDF document text
    • http://debden.org/userfiles/file/6919332383.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/60627330686.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f39244e44---6166173792.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/51344846556.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf05300a29e---64951674457.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b0c5bff613e7ea7f0753ae9bf077f917/zaparidapon.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/wabikar.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4105d448669df931e3a0fc107c8d96d0/pelinufujolososexirone.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f54677bf---fasifinofiv.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c3b464e3---sejikixizoban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=leo+playcard+compatible+gamesPDF 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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 17176 bytes
SHA-256: f2d9f77b25112d29d9b8d3cb43169187664471a03d0f6bd92ee2c124ae32d859
font_02_sfnt_off00012c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 10964 bytes
SHA-256: 07a5b3e3daff35a59a71e0426c33c28aed546c36804345cba3340551e341dda6
font_03_sfnt_off0001453c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453C 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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