Malicious PDF — malware analysis report

Static analysis result for SHA-256 930c665a147c7a1a…

MALICIOUS

PDF

87.1 KB Created: 2021-08-04 13:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86187f3d74e3cb2ecdebe92eb3f5dd87 SHA-1: cfd1f6792a0b5d07b350b346d246bec5a1ee2bc2 SHA-256: 930c665a147c7a1a1ae06e89b9b79b4cee0d08750116d8c9e0f19e2145b15f99
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of multiple links to potentially compromised WordPress sites and a specific heuristic for callback phishing suggests a scam or phishing attempt. No scripts were extracted, limiting the ability to determine specific execution methods beyond general PDF exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://azizolace.cz/images/file/tadisadiw.pdf In PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddc1007f0---91502386538.pdfIn PDF document text
    • http://synowka.pl/galeria/file/16546343908.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/13213362165.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929bb849200---38212088014.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kuzipozasikupiz.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/980489c9f50605172fa56027b4d2aadb/17937668168.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/50a8cfd1cc43f1a57ef74bbcad372c66/ludatetiriragibodufof.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4de84c56b32684a38e5fd9db335b6455/35520600943.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f545a184642b1c48c77655288c8ee740/tavusexoripunofur.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/5351312207.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/7375408578.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/rutusuxixevudebajotazogew.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/31482533673.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/17871673847.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/xonokitoladowajesakaze.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d36ad9396---divokezapujajagevag.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/22592293902.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/bijepusa.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263e3023f1---fuxafezakolujuzituropona.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/86731108259.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/96194615385.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/xubir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+bypass+google+account+after+resetting+android+phonePDF 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_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 17120 bytes
SHA-256: 98566da21815c8b451031482648fec3064e2b2f0b983e4ac853af7cdf5d638c9
font_01_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 11332 bytes
SHA-256: 1675bc32648df666140ee9c5fe8c8aaa061c358c9e2c0690a2fc5bce2d2af55a

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