Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a4f9fce79243c0…

MALICIOUS

PDF

91.0 KB Created: 2021-07-01 12:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75721b0cf072036d6b24cce326c03d2c SHA-1: 523b062faa37ca25e74bb66e24d0b4717d9d1458 SHA-256: 30a4f9fce79243c00a82577a6966a4abedc40d142ec39084387302b0383cbafb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://nomylo.ru/uplcv?utm_term=woman+of+dignity+final+episode
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/987009110aa9880d197e83f922715700/76788284642.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf4cad0d4---vebovixuguxipuzubufano.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/77637509745.pdf
    • http://ural-resyrs.ru/data/file/4657544401.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c369acdc5033929a9982caa7ee05787b/43893595075.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/95349133065.pdf
    • http://qkmedica.com/uploads/userfiles/file/7956640616.pdf
    • http://abnicum.com/files/file/19176013656.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/k2pfvgietsd0b868q6j6k4nrj1/xuletalerutiworilor.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/74fadfd5fc930bf7f7d564d4f6463dcf/dowuzasugofedavev.pdf
    • https://aimtronu.org/userfiles/file/zaxugux.pdf
    • http://alexhoffordphotography.com/temp/files/file/25295072975.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/u54drrm94oo34kcujhu3j87eas/lekawo.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da592d4ffa0---tefidaj.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8acaf8fc5c---48372259511.pdf
    • http://cecev.com/stockages/files/gomokos.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5b093659c---45378366229.pdf
    • http://teplospectr.ru/images/files/49148229464.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/t8hshrn3nc3d659rhe2ttit1lp/romomadawasagigadu.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e82eba3d0---91361444353.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c7k92hhm0u59jbp04g4du3s9o6/85668858473.pdf
    • https://cgeminfos.ma/upload/file/mabebul.pdf
    • https://filetorme.com/upload/files/29340896881.pdf
    • http://mikailang.net/userfiles/file/20210503191448_285901462.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b3.bin
fd0d0a88f1259f26d3686134c8fbe952be00d6837a342ade0ac5a4646e524dcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 10848 bytes
font_01_sfnt_off00010c82.bin
4eb4c9a606ae3ec312802893022a557c20eec993cc260cfb81d5d0446702215e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 2688 bytes
font_02_sfnt_off000117e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 16792 bytes
font_03_sfnt_off00012ff2.bin
55f86c4058aec6d6f7d9b4c66b51cb7630b1edd8b9bf821f5d63e36039aa3c3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 17124 bytes