Malicious PDF — malware analysis report

Static analysis result for SHA-256 67df8346331a779a…

MALICIOUS

PDF

95.6 KB Created: 2021-07-15 16:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d868700f90efe432fd4cc3ee788cc2a1 SHA-1: 2b57e3d22aee1f60176c150cefa61b156e39bc63 SHA-256: 67df8346331a779a138d812a1e87508eb62e0f4304090cef6bb85b25233ce9ff
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://gorisum.net/fckeditor/upload_file/file/37512590469.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607085b907fc8---zakagexeginedelofez.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/77562955289.pdfIn PDF document text
    • https://digireg.gr/upload/pizagonika.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/5147102450.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/64685729828.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f2fc84fc1b73e9ceb9992e2cdf590477/95264272771.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/62408118958.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210715092405.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40320b87f---14243803989.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23d2e017f---49031211012.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/sopaxobo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1e011333c578cc8846744f6521db3ab3/bilinetubixefogofetafoge.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8f495253---37521060255.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/bololupolixa.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/399f4bb8fd52a94d697cd41d6556af65/79373783755.pdfIn PDF document text
    • https://scriptdd.com/_file/file/22223300042.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2c475f36---75911421029.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/77986779157.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec0fd527e---90785643372.pdfIn PDF document text
    • http://leton.pl/userfiles/file/vepibozu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ufo6gjbc302hou1rcp1kkfkiq4/148077908.pdfIn PDF document text
    • https://irrisyst.eu/files/file/dataxusakavebekug.pdfIn PDF document text
    • http://babamoleskine.com/files/file/suriz.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf8d7b7b7---kegusaburagufeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=parabola+in+conic+sectionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 18844 bytes
SHA-256: fef32b2c4d90889cb2d2fae52855ecc94156d4f4895bf3f545566ccdc0361366
font_01_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 10364 bytes
SHA-256: cc6ec9995ac39e90a9e0197a721a11fad6103203d0af4f54ab365e2fdae8b344
font_02_sfnt_off00014358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14358 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off0001588d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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