Malicious PDF — malware analysis report

Static analysis result for SHA-256 becd61bb7d7ff6a6…

MALICIOUS

PDF

91.3 KB Created: 2021-09-11 21:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcc044d709cd49c9841eb91c5bf7ca5e SHA-1: a7e871ed2fbe203e2c63ef048bbdc07d3248ccc5 SHA-256: becd61bb7d7ff6a6e08f5bf258bcb660d34dc7f39c0ab4b52e0b72d9a214a88f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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 https://luathoanghuy.com/uploads/files/widoxowisaxe.pdf In PDF document text
    • https://vaynhanh365.net/contents/files/movezolizaguriwizazawolad.pdfIn PDF document text
    • http://tai-group.com/upload/files/musobivoxesaru.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/93617648149.pdfIn PDF document text
    • http://schubert-hh.de/image/file/71409988597.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/fuwilifaza.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161398c25716e4---27644323380.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/80254737641.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/75912319596.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u988qln8j1qju9ba0nadi7kk5o/vituxupusogukipobos.pdfIn PDF document text
    • https://rotitelor.com/contents/files/54227245793.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/rirazoxovemasamuxekat.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393a1d2317f---penil.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/3587005238.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc0055dc2---mirefiwulokepekezaxajon.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/52482481578.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/55406990291.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/25740259098.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/puzutalofi.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/69045076818.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/rewuloxazeroketo.pdfIn PDF document text
    • http://chengzechem.com/upload/files/5126148786.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161395bef1eb1b---fezodevezebogawozozoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=driver+lie+anglePDF 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_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 9964 bytes
SHA-256: 2fae1b1132b787f60098cb4c82ede5f44ee8b38e587e9e088bf6eefadee78c46
font_02_sfnt_off00012c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C86 19460 bytes
SHA-256: df2ac620e63909f90affab91c575ff82d8e6420fefb3cedd757353bef62cce26

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