Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90342ba31209865…

MALICIOUS

PDF

100.5 KB Created: 2021-07-02 01:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ff15e8e48313b1d691a27879ea11b64 SHA-1: 548bf97b1be5466b4b43dc221013bbe7ac5254c9 SHA-256: b90342ba31209865089cd7b94183d69f3e528989120a49db65d7410c2b99538c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://hum-lucknow.org/test/fckeditor/file/gexosoboliberetikumutiwu.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/82209d270f1c86895e6a0cb6fd726970/setubudepumujosowinuxuxog.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608052557855f---96571285331.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae30b7d6e4---84129193611.pdf
    • http://veterinariomauracotti.it/userfiles/files/zumijomevabipozotebare.pdf
    • http://appletechsolutions.com/userfiles/file/42094565383.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5cd902c1---wulene.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4b68ee60ba1ff507fb51181c5292960e/lidesiripep.pdf
    • http://asupuro.com/user_data/image//file/matopekufobiditiriroligit.pdf
    • http://ohappy.org/userData/board/file/76717421093.pdf
    • https://uleshuzataruhaz.hu/files/file/35537210379.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a920e58e8f52125dc842434dff8241d8/paxalozitenudiguwafu.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0c674be6995bf2fbfa5ed0531310cd34/mubadajamemaso.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1qfpmiq04jfu5i6sbr809gt9l1/98075849724.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16091fbb48d779---95083546827.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913f8066f02---69505160671.pdf
    • https://gachbinhduong.com/upload/file/fotevutigupezalokipakin.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/oluau26phoq7kh5k2iuk8oipsk/vobukimogexuwofeb.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2c7112cc9f58e5c297454b98b40be8bf/gexomigupawujekaporanap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=collections+merit+badge+pamphlet+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_off0001261b.bin
210a57958cbd8e8eb3cef7376bd7dc66300d0fa829d30243294a5609d0d1bc28
pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 11240 bytes
font_01_sfnt_off00013fc7.bin
7e10d3548f4312a915a789c735f9a5a48fb01aa63c1da838afc3088198e81123
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC7 17236 bytes
font_02_sfnt_off00016d05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D05 16792 bytes