Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4badb941901adf1…

MALICIOUS

PDF

86.4 KB Created: 2021-09-24 10:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0fdccaaae864dfda07226c158cd38874 SHA-1: 21d6e167de828672ad8d81ef7891a158cfb35b38 SHA-256: c4badb941901adf132a31270616c5b670a43a61731488bd60647d70c50c9ebd6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, potentially leading to malicious content or phishing sites. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://wastran.ru/uplcv?utm_term=oobenn+android+app PDF link annotation
    • https://asi-filter.pl/files/file/sopovirivubama.pdfIn PDF document text
    • http://destock-groupe.com/userfiles/file/57668566870.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/u9egg1ecr37bjehm0e6ool6srm/nebinogewibemuloruz.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/52405183334.pdfIn PDF document text
    • http://onelove.cz/file/86049853453.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/jevinis.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210919091751.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/xunenudolovevasumuzunora.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/95492643363.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/26252211582.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/74238309032.pdfIn PDF document text
    • https://peterdegendt.be/file/lukejaziloral.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/66511878227.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bd71444a6243536983e14c74b1134869/ximukejivigesanutulun.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/5476188426.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/20963617944.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109021918141027.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/30220949016.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/kabifijexaxijir.pdfIn PDF document text
    • https://toocapen.com/files/2523943426.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148849d42ed1---duradovopu.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gotera.pdfIn PDF document text
    • https://buka.ru/sadm_files/33476709812.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1d00159e31ae1e17c9f641f1ea859c36/50822714162.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/kimupejolumevafujugu.pdfIn PDF document text
    • http://risme.vn/files/jodanugumuzolowibege.pdfIn PDF document text
    • 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_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 10240 bytes
SHA-256: b9426d79598508d429eaa1db11da35062ae015849c4c0caf314eb6d80f017b97
font_02_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 17228 bytes
SHA-256: e53c22930a92653164b2bc3e0cbf0aebaa596895ae2a195a073d10e1652abebf

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