Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa175315310e4f63…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 18:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f705d5b0a2b1c40fe576a8623ce42a9a SHA-1: 462ca32e7d4506b15c45cba7a750ff87bf51c2da SHA-256: fa175315310e4f63c3d880956fd1e4a9b237948da02fba1a8248c37677093381
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of a 'Callback phishing phone lure' heuristic further supports a phishing or scam attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely involving the embedded URLs to deliver a payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=iphone+ringtone+for+android+download PDF link annotation
    • http://steelbo.com/uploads/admins/u0/files/20210906053649.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/ranamolorapud.pdfIn PDF document text
    • https://izr.fr/files/xupetusobimekaxibu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5f60398f---67268831141.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/nesajezefatifodejexefo.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/tadeg.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/18831399889.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sb82n2qh6q3ld8famfc5kjmg5u/1541732047.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/lepafanufavepira.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/25088996180.pdfIn PDF document text
    • https://cooperspick.com/files/votosaf.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/76136334270.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/69588737308.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/zudasalaxibumero.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/33cf2ece8ea7ca9725cf0a3b9262e008/xifugitikabogawuda.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/23416387471.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16142f2d73a726---kodofalafiv.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/90482671087.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/3433301872.pdfIn PDF document text
    • https://masukpt1.com/contents/files/jakoxegazajige.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/57160571095.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/fetelise.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/94404499083.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/32508058093.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_off0000c157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC157 10644 bytes
SHA-256: 152fb9948a46ec556b824fa33ab7d845b0b66e9307e835c87c442d4988e81586
font_01_sfnt_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 17716 bytes
SHA-256: 655752900dad8314a69ef3b952819d259cf9e7815ac6acf5171668876a5d8c69
font_02_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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