Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dc6ca312c8d8e6…

MALICIOUS

PDF

106.3 KB Created: 2021-07-18 10:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6e780acd205289d8b4c474a5f82342e SHA-1: f2580076b80c549bc8bf0c740b19038780f5053f SHA-256: 41dc6ca312c8d8e6e89d8c482926b8fc7af93b17fac682c2d50ef29c8d79efcf
176 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. The document contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/50563784a46c9b237db2bb37b76b2bc3/tasinitegoseto.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab42ca1c9---kivazidawosetibusimidij.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/xipoja.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/mupuvakoj.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/19209313756.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9hkt4gh6ihleqh2eioeisverv4/77622822762.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/1883998363.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54cbcc4e0---zidalaginivizowomonu.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/60931731054.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/86201425258.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae21cded9a---87341817220.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gq92u8nrolh2c9tpb4k1okgsj8/16419705309.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/64348304976.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gurivegariwipazo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798626cc475---50882573556.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608963e562dc9---4170317252.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/47213650733.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/cd2f76a857fb614560de2762711e5913/98983811591.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/susekov.pdfIn PDF document text
    • http://tano-cable.com/d/files/dufujipexofopuxajadenepi.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/musujarigebozakudorot.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/noleda.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/39644248858.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bfs6u7m1etvfpjhgv3apauogp5/kibiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=representative+government+examplesPDF 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_off00013a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0A 17992 bytes
SHA-256: efb52c68b1d3c8c842c5f0c25673b3771284f4bb25bd62bbf2155f634889385e
font_01_sfnt_off00016951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16951 10808 bytes
SHA-256: 87a7fa448534ebb51a16771bcca7a25e8529520e9d257288c3e1a6854f4164ad
font_02_sfnt_off00018247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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