Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c20035809d173c…

MALICIOUS

PDF

84.4 KB Created: 2021-08-14 19:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93a20678e3ec4f76908e960f2605afcf SHA-1: 5550b04c03e5c0f486ae9d16e8e271331ab6d9a7 SHA-256: 47c20035809d173c2f3cf18222a1d118f8556d3062a6c1d0da45b32ebf0ef735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute or obscure malicious content. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing or spam distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/fnfksgp5q8ebr0ilo9gf4u20q5/zalaluwizojinu.pdf In PDF document text
    • http://kassa.pl/userfiles/file/rojukaxixuxokiminafijur.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed9818190---vekexuvadetegiworeduxaz.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f87ba52c---79721107494.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dumokakutebidavobituvima.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1jvm3qrhvu6drcraq9b77hcbtt/38110441900.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/72765889504.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/genivovubug.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb478cd6924---3118835902.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/27153131510.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/11170555566.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/dc8d4ab69551818996e58994bc72c883/67151310695.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/69033158495.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/kudp07saql3mrtbg5eij7afat3/10112359221.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac644e2a78d---22029212970.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ciaj68a7o8l76q3jje5f3v213p/xajamuzepazo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/20c78329f59311e5e8aea84cb1ab5ff7/gadarazapakexon.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/65329793462.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e150238aa90138381cdd93336778e5e3/37338614485.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/88350a867e16c628a1ad8f5eda617d35/vawamaw.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p6qf7r14s5ccg1odm8j7ee1o55/91230445285.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cc750dab---70902995448.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/pedixof.pdfIn PDF document text
    • http://hncastlecable.com/d/files/gilibojipud.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/21924069646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=8x8+led+matrix+arduino+uno+code+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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10928 bytes
SHA-256: 7179f0fec42ddc21d253238b024c491b05ed5e37eb9858c5e22087942200e30f
font_02_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 17432 bytes
SHA-256: 5d522d09f4a58296e9fa982b29da0438a9ab68b183e5d63dbfaedb80c82bc8cd