Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa1d9d33e395cc1…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 11:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee048383713cfc44ba00f80bc4782a4d SHA-1: 3a9d92e50183ff545fb052c40310a56b48b541fa SHA-256: 3aa1d9d33e395cc1c6c49b7931d0209a4e4be432e3de67a64cef988cb888f048
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 compromised WordPress sites and disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076f57c95350---14822932908.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf352d8f76---89066718069.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_6257E20AA9A13F22.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/nopibamudotizijok.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/fexodojosozuzoju.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/lupalewisotarezepesuwuf.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/kodufijudujizawanujan.pdfIn PDF document text
    • http://shesob.com/file/files/61675136559.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37d4d5fdb7---nuxafamefagevaf.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/10690828007.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050900080930.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/47151252003.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/m919i54p70t03u89gv8efro2e6/jejewuwumibe.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/65256095730.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25892292de---lonifiroruvaregud.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/77719783610.pdfIn PDF document text
    • http://fitviewer.de/files/file/gufejopaxon.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f32231241951028557be891572225bca/lojepejagovixewuzo.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/4863290820.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210701_142722.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/wusuwezilabid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ischemic+heart+failure+pdfPDF 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_off0000bec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC0 16684 bytes
SHA-256: fbdb6e9d20d028788bd6d3f0eb39dfe366bd8cb1562d96b57fcf0fc1c96f12df
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 10712 bytes
SHA-256: 43a6924feb8c12cd5ff5ecf4b66c6a6461543ba65e0e5fae5e90ce0a7a847787