Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49de780785ff6d2…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 10:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 64ae2107bc3af5f117293248deb503b3 SHA-1: f881e9e38c2b33294c3bdb8dfdbf0bca0d805890 SHA-256: e49de780785ff6d2fff2e22827c913e0abc8e8ae9d3688a49171e3827e7f7bc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on compromised WordPress installations. The primary function appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=fifty+shades+darker+unrated+free PDF link annotation
    • http://beergolfers.com/blog/images/file/50276082778.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nmo5cjdgiudoc347ctb12v00q7/55492318024.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/bonudal.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614275369981a---84585365353.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/faloxopelunerawuni.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/14928514959.pdfIn PDF document text
    • https://theurbanthinktank.com/files/rezujakoporonupewejodoxuj.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/74080737425.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/sojilexaxumatudakagebagaj.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/80784760401.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/32315637001.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/37717908458.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/pimosimuruworonifusev.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363749f1834---putasulamaxeduvijeb.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/dorojumonumamapepuralaju.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/4445421955.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/38530523200.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/dikazonimiwotudaw.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/nuleg.pdfIn PDF document text
    • http://methese.com/upload/files/83187360928.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/mezijezoxosefadebejuwer.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b66mtnlbhpg7ffmdkhklrkjk0n/9210048207.pdfIn PDF document text
    • 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_off0000b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB000 14920 bytes
SHA-256: ef87d751b8534971e73f5ad1198a509706abd223b32ac5246764d883b6e07df8
font_01_sfnt_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 10568 bytes
SHA-256: 1657fdfbff863309ab0069a200cc28e0e3b67d7e411856f61119952d82271346