Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b9a0e74303a0a2…

MALICIOUS

PDF

79.9 KB Created: 2021-07-02 12:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68a34928f32fce70dda1e8c35add0447 SHA-1: 19c2ae4813a2806d621ebd4452844c6b55679a23 SHA-256: 31b9a0e74303a0a21e619f90b6791097d0cd5c33582f17bef6ed0ae9042ed8c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf331730b10---15642531294.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6a09e35ebf0ccff28f03b35072624b71/50920912831.pdf
    • http://murphysbeads.com/clients/54316/File/59251616553.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d564009c21862e0c557d6393889a8ba7/58142084388.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e51487b9---80375924465.pdf
    • http://sanga.asia/userData/board/file/gejomesafuzuwudilamoku.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/47574322172.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210623_068A7FC011891479.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/eqvcmb373f32g8t74ec7og6709/39839591354.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m74tpbr6hdnd0c7j6bs23md1a6/dasodim.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/iin59srvtk12bi75vcr7hov837/81966367778.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a4142a3b1---pibij.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa55b7524---68244044556.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce154568d---53401164712.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9f2411523ac6f9784342f8f510b86d2f/fogujibemibu.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4a114ffc3883175ef4095b405d1a4410/95628154057.pdf
    • https://ndmoyun.com/calisma2/files/uploads/8448468865.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ls6f7j2bf9hisga6m50rfks5g7/xarivuju.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e7b19a7309ba76e311c586b57e9bc0f7/1114720508.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18699717a---xowajemutad.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/bf4262e4b4e93ad17b5064f14cc3db14/felabagunurofokizij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wire+nail+manufacturing+business+plan+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_off0000d806.bin
2c22bb6dd0384ce037a988f1beaa854274d8c1c4e7a80f202d7cafc94632a540
pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 11076 bytes
font_01_sfnt_off0000f165.bin
9fe0ce46eda6786c29a5690da7621b5cf270417b98a60ecbe6de17c949e1a0e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 15956 bytes
font_02_sfnt_off00011a60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 16792 bytes