Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bb5bc87409db8e…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 16:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03f823c0e516c474cdeca3e708e57e40 SHA-1: 33621d85f8933ce67f2412a8ec690859f3a795fd SHA-256: 37bb5bc87409db8e4f22542cd3898babeb75c6b6a9b765313c6e2e84de65a928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to lure users to malicious content or phishing pages. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2d4557b920274466b04e0c6961b3bb83/74062083922.pdf In PDF document text
    • http://kassa.pl/userfiles/file/51870620875.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/08ae8caf31d3ce8373e60408397c22bd/8522739280.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/95019288800.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/83271602944.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/51f71dcf7ddb58b7762f89013ef67b1d/vijufawez.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/trd3lcla0lbsasg1a16jb7tdht/nalipabako.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2866d4ea0---zaguvavizutikimak.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/wewexogawat.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c00d580201a---nazikisefebiwerezinuvom.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3b0d478d---97262949603.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c29eaf7ea---80428090940.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/mejovosewijavupum.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/11819613123.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb47056a17---zurojezedowi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/68e20f0e9edf63d19b384c971c6de69d/pagesavimulimofuxer.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/172a008b103fee158c963e62b19dd7f4/valinaxilido.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1dbfd24be---59178952130.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/43837863228.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/tuxopobubijerewepevige.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/71494837391.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/83e8b62cfec8135f285710903e17ab67/3404453715.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/badipapelirimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gst+state+code+list+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 10448 bytes
SHA-256: af06102e5387eebe06ac77c64da36a144af621a889599aa64f9e47d58582b409
font_02_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 18320 bytes
SHA-256: 2e947c6a4f2b1564d81b7b511ce5c75d8476758d4e6803da9e020c7d59f93550

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