Malicious PDF — malware analysis report

Static analysis result for SHA-256 31719cadbd2b3304…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 08:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fee6cd750fbdcbf94d6ec8a5cc45c948 SHA-1: 0d5e24a828c14d0c301268e3b3d6ce3764e145cd SHA-256: 31719cadbd2b3304c757b4e5649cd951ba5ecf4f4b520ad996096026eb2dc26f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised hosting points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609830c5b9a57---ruporalaxalidute.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/93cfee07afed9a9546ec713e2bd70e11/8456165639.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f3d23dc46e81ebea1dbb98ea6dda9525/telupituxatel.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c860ac1a4a4---11957526038.pdf
    • https://pet-fashion.ro/mm/file/91890516213.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6cc67ab9cac95d3fbcc11a787476ef37/laderataxug.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ptajnuhjt9rsf4vrcj7djskjui/juxopeselipunoparebilibip.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f03f7ba816---latukadudelekiwejekusak.pdf
    • http://cappellastudio.it/userfiles/files/xebiku.pdf
    • http://firstcuwire.com/file_media/file_image/file/80057560405.pdf
    • http://dok-vo.ru/userfiles/file/gowamubuzenobiwamelolo.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7280c8e6d77872bdbce9e669769216d1/rukos.pdf
    • http://www.css-jp.com/upfile/files/2021/06/19/kosujagazerujodedivagoji.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/43ac486acf5b6f5cf82729f1d3df1bf1/lelirozuturijadivejimo.pdf
    • https://oklogistic.lv/upload/file/77145822644.pdf
    • http://brainbond.ro/userfiles/file/41966800701.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2i8qkhhqhm3k0bdf2ci4p7mr0s/19411998036.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/lav1skqruprb7jd9brr5an0m43/15169876037.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160db57d285d4c---53201059875.pdf
    • http://rayanchem.com/d/files/81764749390.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1i3ru2oii1i6dfd1tvmeqjkn54/74674265601.pdf
    • http://adbuffalony.com/uploads/files/49891286775.pdf
    • http://serdceprirody.ru/userfiles/file/kitovepapij.pdf
    • http://fairway.cc/images/blog//file/48859766962.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d7eb39551---butog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=disc+bulge+meaning+in+tamil
    • 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_off0000f291.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16792 bytes
font_01_sfnt_off00010aa8.bin
6ac8e51c7471f6483ef14a429f5e8070419be37a2e79ed8de1d706bbfd38b01c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 10592 bytes
font_02_sfnt_off000122e3.bin
e59225e291fce8eaca88db70b6efe52bf37b2fbc657d85d6c0a2eaaaba649575
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16636 bytes