Malicious PDF — malware analysis report

Static analysis result for SHA-256 daee473dafc472d6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 04:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e3e83cda8c2358dceebce8ba3e04bfb SHA-1: 355d38c12d86b6e40c468fe5d362fe81227a82b2 SHA-256: daee473dafc472d6f0aa47e058bf1bd991e6a24c6a8b8e9ee9b870d2352af419
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, forming a link farm. The presence of these links and the heuristic indicating a callback phishing lure suggest the document's purpose is to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://5percent-design-action.com/upload/users/files/torijuworosaxisalopomegip.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/6938182798.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bc3efa0114b65b7da7e9e2a15f4ec4f6/45398575275.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/nabubepijuvifijogepiz.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/75814091299.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2889c155adfd68fc80f12de95062e139/vetatawilelusoxakogurija.pdfIn PDF document text
    • http://parfumland.sk/upl/wafap.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/47764545220.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/88226566792.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/33339076010.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/sojuwo.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/wupuluwinonurulamusuref.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/21825144949.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/62522563938.pdfIn PDF document text
    • https://slotpt2.com/contents/files/95788605515.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/zorepuvenivapuxitubel.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/zutagugimezufovoda.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133876760666---48742375492.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/79408120695.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/mesuviromipoge.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/30211909441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bucket+list+marathi+movie+watch+online+free+123moviesPDF 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_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 18100 bytes
SHA-256: 8093eaeadebe0579eb3988e248bf284722be465572df3f5ef3038685faa95907
font_01_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 11340 bytes
SHA-256: c28a585299ebf9cdf294f5d188050159b3d8b6f6322eecefb1afd47afc930109
font_02_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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