Malicious PDF — malware analysis report

Static analysis result for SHA-256 3937f57323400790…

MALICIOUS

PDF

86.6 KB Created: 2021-07-03 01:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cef1ac30f081d7a1815ebe7100e02818 SHA-1: 21d054e04554fc8c0012e4ba9143e7ea71a0b444 SHA-256: 3937f57323400790c9aaf49d5400116ca25d941a4a1f345078c3ea96631cacd8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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 http://langeline.com/ckeditor/upload/files/86988284959.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7e4c758f---34918937995.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd8481ee0---28408491774.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ukb5mvve1mns9651r3vo3o56l3/6452280234.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/5352956014.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c309dd97f82---kofewuruxagefikovugaga.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/xavopajegaxeje.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/55946737558.pdfIn PDF document text
    • https://kopari.hu/files/file/35097835856.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/15603332405.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bee7f612584---nekididurefatugetuva.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/47397190666.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/dorotisujipateso.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607478961ddd4---87428865783.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/42638711719.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/milifomuxak.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/sodebujiwivugigonabiw.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609825d710921---92014703562.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c5e91edf9f4f93a3b1658d1186326726/92571384700.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/37244600117.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b4991942---wukirerimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=timeline+powerpoint+template+freePDF 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_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 18312 bytes
SHA-256: ed019021b921c9c0d1c8d496930533304664ad195807015e754d836d377bdc55
font_02_sfnt_off000135c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C0 10400 bytes
SHA-256: 87ff6f7f53a2928b69ccba815fe85f94adcaa388f207895f18093d41b8eac153

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