Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c70876bf0814519…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 19:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb281f4a56dd233f93c6e965976fcfa2 SHA-1: 37b256d4766d8de5c18739a96b4d40e37f54b361 SHA-256: 3c70876bf0814519d952f29e709a4e1c0445f943bca02a67ea79eea419a74d61
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://terezmisszio.eu/files/file/wolowivelifotabuwegukuti.pdf In PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/pijixasedufavoboguko.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/sobupajitani.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/memugogetavizus.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/2635234861.pdfIn PDF document text
    • https://matratva.in/userfiles/file/91153763174.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/vudanizofabifedefebevirer.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/pukuxir.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/nojutibelu.pdfIn PDF document text
    • https://motacademy.it/file/48366164049.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xotirujajumet.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/lobodadewogizigapiku.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/vbnap4chijm2kupb2au2t5quca/20943287597.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202152422349.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f1e2c37b9---83916514366.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bb74a720---bijibup.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/nasogewalumalodeve.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/27284448956.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/1702722006.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/57523728672.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa4a56c8a---guburefojuzeziwo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b807af0e8d5254d9e40233f2bce83a1d/24353880817.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/29283fced37576c902f8ca48bcb498e6/97518103670.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bidasadamoladimin.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/63994502026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=convert+pdf+file+free+downloadPDF 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_off0000ce3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3B 17676 bytes
SHA-256: 67f54a29b509d4cd692c545c2cb774897814e1c8970d6fb015daabc534be3def
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 10508 bytes
SHA-256: 9a7475b738c9fa12cd4f9142d77a5a872284a0865f7b52615a75967f1e060f6e

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