Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab29ba9f021fed7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 11:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f63a942b4acb70f3bef331fd8491fd33 SHA-1: 3170c07a4049d70357711e44a9bbed6db4fdb291 SHA-256: 1ab29ba9f021fed7efe49105b7f6bb6d4aaebacc068001223d05d52c547e8d9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file contains a link farm directing users to multiple URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pretext, although the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac00bd44f---94836074040.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722330810bb---pogiborawitufodu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab3cac629---fejipizatojurotokuwurunam.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/20718548692.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/vibutama.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/97645605753.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd869e0530e---36169257068.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aab64ac0---fefubajuvivojito.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/durodonixizifomejo.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zidurawuveminagejepum.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/45002000992.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/10754224925.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e9cb37dab7476a03a515adc70602b0ed/wobasajomugoxoledigus.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108070741524226.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/76971903797.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/pabamisilapenubenabekexog.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/86933435063.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160806b15c6488---65064572856.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/woninonusemasoba.pdfIn PDF document text
    • https://33mobility.net/uploads/files/lesag.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/getaxuwowap.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0fa4af413---ridutefilux.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/sinozopimug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=general+outpatient+clinicPDF 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_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 10340 bytes
SHA-256: 4fe045c4467502e90fd398948ade4da2a3fa4eda75347d8a14844361bbe5a620
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 17684 bytes
SHA-256: a0b4ce515f7eda90307571b2f6052ee117e0f96c191961cb8b52ea118d59f5db
font_02_sfnt_off00012db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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