Malicious PDF — malware analysis report

Static analysis result for SHA-256 a398ac8c81e77d50…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 07:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd6bd44b6c0810b2ba4be6102db1a022 SHA-1: e5fb537858ae80dc1b2c460220e52bfc2e6cf58d SHA-256: a398ac8c81e77d50806bd8293f380aaeb5039c035b9318403f1d0e757140c5aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext, and the ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm are indicative of a phishing or malware delivery attempt, likely via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/zanitusas.pdf In PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/jogaxijemajipodefagi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920073da23---kozalakan.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c40579ffb5---mugutafi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97e1d58f7a---92264350449.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/3399027145.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/30721710990.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/38481189755.pdfIn PDF document text
    • https://orangerun.re/photo/files/pepapuvusulu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf26226f5---samukapuzekowi.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mt926idmv17hpc4gvi8d0ou9m5/lowekefuru.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/wobinuduwi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609452bd7329a---56736819929.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/lebepusowexen.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/55234120140.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/sekuze.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/ludiritedunaxalere.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-30/20210530172509790564.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/91588442207.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2e1352fb---89428126376.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/fejesifedumavirox.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/91359784929.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f373a824---51339341567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bcg+matrix+explained+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_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 18652 bytes
SHA-256: 174c9ff7dc67f43d20b33d4c6d951a3a25e0ccb4ecd626bd9070754a8ed88802
font_02_sfnt_off0001584e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584E 10828 bytes
SHA-256: 091058ad4f265d9ea1f7c456eae065da3360c5f9a7ee41de6918baac05680299

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