Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c1a1c9f9535e71…

MALICIOUS

PDF

104.4 KB Created: 2021-07-08 02:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 445c0157520a650a642f4a7c127877ef SHA-1: 4a566ebe6a33b3d0093b2f05af1e845914948ea2 SHA-256: a7c1a1c9f9535e712d903f8ff6ce30e3d81fae71673248401a6ea0b73e6ac452
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm, directing users to multiple compromised websites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/tkk0jbv38krvut4uteeetfmpn8/roxamewanil.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/29231469354.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6fb0c7a9f7160d1a8bfe9d15cc6f7198/83933864373.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/93be31ecc20e6f68af67e5d8da7ed869/58010198933.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/70720930287.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/tevavuluxabuwuwag.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/826c3b0d6f326712d58d2d92ee08cfe1/3362015547.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/074b1b856abefe1c1ad0b79205571b6c/pefob.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160968440b29e3---bepupejetofiretazeg.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/vg276f8k9cerutc1er8o6n2088/39859622460.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16082e965460fb---vaxusaw.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mepojolevevaxukafatak.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7be80115d2---taratitaxukapopimoviv.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/80375774453.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160836e1c54953---janebanebi.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/89791930798.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/nixobubefamomenasitilab.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/256e5b4ee4aa0dc9c9550353f91991eb/96942400769.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a53da0495a0---lanupoxowuwizadunumix.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a39e288e8a4---disuzagem.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/da9a24a4284b8cb33b5fda76e1bfc550/99534016083.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/51235856616.pdfIn PDF document text
    • http://absigorta.com/E/file/40509173746.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa280b84089---romapupirenifelagojarazug.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e986ac6a---37755415256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+answer+unemployment+claim+questionsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 10972 bytes
SHA-256: 2bf722082d52b5b1855183876da94913d43daf78cdde6c5826e08febefed1519
font_01_sfnt_off00012733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12733 2268 bytes
SHA-256: ab818928fc077df21b67fc06afc04921809b57772c79eb29c4cde4b5f904ea9f
font_02_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 19340 bytes
SHA-256: 38e80b19ff3aabb76f67ddc9ebb9f45f3773d782ad86a0a862369d83dce281cc
font_03_sfnt_off00016321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16321 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_04_sfnt_off00017abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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