Malicious PDF — malware analysis report

Static analysis result for SHA-256 63970b7208fa1c99…

MALICIOUS

PDF

75.8 KB Created: 2021-06-26 02:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6290b859907e075150ca71f4de18444e SHA-1: f5c13e667732839e769d46de00712ebd16879e16 SHA-256: 63970b7208fa1c99bb3426e0322698c01877293ad3b436d67c8f167e191d974d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous links to external PDF files hosted on compromised WordPress sites suggests a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick the user into calling a phone number, consistent with tech-support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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) or Microsoft license-boilerplate 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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815d545732---2299997239.pdf In PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/d36f9ee81b7b2bf07cb7956f8e547382/30969578314.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/90771741534.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b4773495ea1cfca9cdf84f58bf9af895/70223326501.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/71265863560.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/tiraruvuzosuleru.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a5eb90a2---3041390010.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7cnjuj6dnb9eu3sjh03n1lpvh1/95701238333.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/50806643851.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ebd4i1c0lf5t5ha9gbecbf87dh/62056122320.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095f47bf1782---77998332073.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/98616131663.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/7l73a86kf1hbs7klu9jr6ln0h6/51033403961.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/22057076611.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/60347093709.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/gilasazaxakefevotor.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4398b00742---sutagorolu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609d901e48462---19818801512.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/24203490247.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607e5de721144---42277207145.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a885c15ad89---68877335877.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/1476385835.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27b5be5bc7c4af5d8d3c29064a4b57b3/11083363833.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/lapunaz.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/c96a23c1bb77555c14b494090bf3f777/85521504771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=email+to+pdf+iphonePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 16160 bytes
SHA-256: 087957a056790ef57bdd3c75f5a96f7b7f880f5244fdbef2742d996299609397
font_02_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10476 bytes
SHA-256: 90b40a106026cc134631997c439856fa373127f87d013fdec647c24cfa9a9484

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