Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6c7422679c7a71…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 08:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 355527c394a73e3724c1a1b63da6b1af SHA-1: 0e79d5f32bdf49c2c4daceef2463322e2db11819 SHA-256: 0f6c7422679c7a716ea20723a9d997127a231b962a0ec2d60f67bb3f7332636b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ainut.fi/userfiles/file/52845642824.pdf
    • http://gapoom.com/upload/fckeditor/file/64123146642.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5dba9fb3---gikat.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece6eda6b2---betujazawegogokuw.pdf
    • http://minhphucvietnam.com/uploads/userfiles/file/bufogibosinixamivugamad.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8dae2ab1---27132447171.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c36a791b---rokotupepogudoxatovin.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fceb3ab39---bulubuwuxow.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2b98deb34---wezoleju.pdf
    • http://akssert.com/userfiles/files/52244138391.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3699ebea36---xojibul.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef7288fef---90494111014.pdf
    • https://anthonygillant.com/userfiles/file/93698984960.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/623f68439c7e8b0505c17cd73b751a0f/veruginobuba.pdf
    • http://ducthoaudio.com/upload/files/kenoranusaso.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2f49e832ef48ef3d60ef3f2113f35bfe/wewozebununu.pdf
    • http://ahchala.com/img/file/30022768567.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e613bb33c71fcd9ab93b5ad4333a9122/monozerazevejov.pdf
    • http://nensi.si/upload/file/23205859454.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866cbe50bd6---30438352464.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092264a5de92---noxidukinerumo.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/58a5b10915ac030a88ac95f2450aeb7d/zelokofatagu.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609557ef93512---84772711297.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/3473775838.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+haves+and+the+have+nots+season+7+episode+10
    • 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_off0000ed74.bin
b0d60195783611ee4b1709053a2f39940b8cbefe34c22b21c2f99202b7ca04da
pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10596 bytes
font_01_sfnt_off000105ad.bin
a3e30709f74d03375961501ec109e402d70c5e42e451db2181db98a453c11330
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 18160 bytes
font_02_sfnt_off0001336a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1336A 16792 bytes