Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7c2e52507ef440…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 11:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9699a428a964e105ac0ccd2325148ea SHA-1: 74535ef26134bb03a5619278ea5d29a53a555818 SHA-256: cf7c2e52507ef440be7985f8935a13849f5252b4f29335e38c3b9c425c4993de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The presence of a 'Callback phishing phone lure' heuristic further suggests that the document is intended to trick users into interacting with malicious infrastructure. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=mini+militia+2+mod+apk PDF link annotation
    • https://marblobathware.com/app/webroot/img/files/27096643275.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/neposufuv.pdfIn PDF document text
    • http://grotech.in/userfiles/file/39604535481.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/magevoji.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/powexiwapinagawipuwokuvo.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/26929399955.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/22715131755.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/fopejijotaravoxakozaviri.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/rexipunim.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8e742737cc298c276b94628a90d8d091/8429788181.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/31386685338.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141efa9204f3---97491919910.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/99596797593.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0bacf505---56937826685.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/76375325746.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/19c124e746c2c7bf3bd5543713ebcd35/59221637667.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/jukudofekazilabovodijudi.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/83489873487.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/89884195776.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/46331143658.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89408a062---megesinixukam.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/jisebusuzimaxexegevu.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/67476112815.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/38549753254.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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10360 bytes
SHA-256: 087b5bbb88b8d32e87d4164b8f565e2fab4fe612a01a2d4c0dc7a573420b8e89
font_02_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 16828 bytes
SHA-256: 0eaaf9a4acc24912a0e98429e7101eb56ec5624125130bb3d00accb236864ff0