Malicious PDF — malware analysis report

Static analysis result for SHA-256 31be249fc1a03c3c…

MALICIOUS

PDF

91.9 KB Created: 2021-07-01 21:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8d72f889b14690c5ef8c6484e413b67 SHA-1: 433d943f7133805810a9bfbb622e468311212522 SHA-256: 31be249fc1a03c3c4feb99b1bf37d404dda6faf752c8cfec9c646ab013060178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://archism.ru/uplcv?utm_term=how+to+transfer+all+my+photos+from+iphone+to+external+hard+drive
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d64574e25---41878753143.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0f2575f643b89dcd94535f224e9c287f/41407599971.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/cs22j71u3hkbsep0ic8qd8lf43/18400564907.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e4069703a13e52ec7d1beff77d17c369/jonenariwuzugul.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/2738794895.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/95293186297.pdf
    • http://armanetti.com/images/35025199523.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7961725a3---8046752701.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acf43961acc---17288628088.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4e07a38b375565243239ddb3e3dfb14b/wufel.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejizilewivekukoxeva.pdf
    • https://mertlakustika.cz/images/pages/file/79685304814.pdf
    • http://dentalcenterstudio.it/userfiles/files/9915091503.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/54be5fac73372081806a1c3082bd881b/musagipa.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e4d5b5b4---44888249851.pdf
    • https://prtl.pl/userfiles/file/43905918866.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f3d9f21a72473038b20fbabd7d817e8f/34314092609.pdf
    • https://clap-bas.com/userfiles/file/wigikixu.pdf
    • http://agnieszkapawlik.com/userfiles/file/wuzewevases.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d911aa3b99d---87651115873.pdf
    • http://pressvaluation.net/userfiles/file/wavuma.pdf
    • https://bursac.net/userfiles/file/turiwimabenakexuvideman.pdf
    • http://aarogyamedico.com/userfiles/file/7340690113.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/gupesomirofifuliresigufo.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1fbaa4cdf---roroduzov.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/f9aquucahe7o8bol7rmn9pcirt/69185939889.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f294b1f20---sedajizapabal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 16792 bytes
font_01_sfnt_off00011b1d.bin
f604ca460e60154b65b8292a00a92af46b74aedf05a9294b50342e7bb83d647f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 17228 bytes
font_02_sfnt_off000147d9.bin
bb7470b2e185a5f3e0e9cecfb54c268761b1cccae3bf3c700f161cada9b4774c
pdf-font-stream PDF embedded font (sfnt) at offset 0x147D9 11120 bytes