Malicious PDF — malware analysis report

Static analysis result for SHA-256 0036638e10210167…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 08:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 928a7da68cf0fd1da1da596f2c5ab438 SHA-1: f920a2295efe0928823fb8696668bd0125dd4b87 SHA-256: 0036638e10210167aadff9691c0e9c60d0edab2d7d05a18e8d552ab0026ac564
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of numerous external URLs, many hosted on compromised WordPress sites, suggests a link farm designed to redirect users to malicious content. 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. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=foxit+phantompdf+crop PDF link annotation
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bofoelonninnqip9vfn85lm2st/99798604773.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72312492987.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160965211f2f3c---71116618365.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/fixubezumujof.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/82808390191.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7354d16e267ddaf7c35cc027cb4082ca/64876752096.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/74180081755.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/92957758145.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/37997344581.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/29950130135.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/9843858303.pdfIn PDF document text
    • http://bptramptour.pl/files/file/52661504463.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5d1b98fe2e7249d1e555e69dac3cf379/radalokesivadawilavuvonu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a3e831e16---85048469136.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/dupegasilubegezimexitox.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66654889877.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/62177658773.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/49825251094.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ecb415eb80a6611a34637704d369a232/pokigabesuvizoxudipa.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/73191611592.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/45134621734.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/vowokiguwozoredebibiluju.pdfIn PDF document text
    • http://capital96.com/userfiles/file/74597958499.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/06d788e150d2e9994996087658fb633a/20064899637.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161216b77ad3ab---47791865528.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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 17572 bytes
SHA-256: 6fd4e1b596a4a7ced1a667ff4fe6fc0f9e78a7c7a534fbf9e47e6cf786b23122
font_01_sfnt_off00011640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 10620 bytes
SHA-256: ee987435c5d70ca76a7b967567e8c2dec78c6aaa1978c2283196f229d40ea7c7

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