Malicious PDF — malware analysis report

Static analysis result for SHA-256 9981ded0eda6a9db…

MALICIOUS

PDF

86.8 KB Created: 2021-08-08 03:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c29b1392d6d1bb35184819d9951927d3 SHA-1: 221cbbd173f8c8ba5b6590877ba9778f542ee635 SHA-256: 9981ded0eda6a9db6d139a9e0f3522128236ae4b65b0abfcc188860ccf8868ca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of this lure, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5af7d4da6cc8ded156764e5a5e6f2d59/vobederodesiratus.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d5bc666df2349208de01261696f078eb/1787052583.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16210568309422.pdf
    • http://sujitonweb.com/userfiles/files/48519324292.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67495e7ba3---31924495595.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df895351120---bugokedirewegolevanozore.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/89213191071.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc160171e---zebefumepepagifoni.pdf
    • http://poltinka.ru/userfiles/file/7071144697.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/vatit.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f6aa7d91bbbab5ed5c68870ae8d7ca84/jilixefutafokutigu.pdf
    • http://digjamaica.com/app/webroot/files/75240287523.pdf
    • http://wisdomtours.net/upload/file/xalozukokowafiwum.pdf
    • http://wolfroccatiassociati.it/userfiles/files/11872285444.pdf
    • http://theclubburger.com/uploads/files/26486556852.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f23beec10d9ba227473205bc9fb0f5b9/44439902864.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5jlgar92p70j9e3fm0mubqse81/wibet.pdf
    • https://edusfera.pl/upload/file/marosumefewuwe.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/738916c3b43b4113e39b51ded3af3a1c/mepuxegibepit.pdf
    • https://niboparis.com/upload/fckeditor/files/ladodetezepagojuxatuvob.pdf
    • https://kenadong.com/contents//files/xotufopixonito.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e7907355f16---36985779597.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608947e2e3a9c---bexebixidamajotifun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+exercise+works+the+front+deltoids
    • 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_off0000efaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 16792 bytes
font_01_sfnt_off000107c1.bin
dba8c98b24362dfaf5410173a041aac3a346f47d7d0996ed3621b1fae62b6591
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 16932 bytes
font_02_sfnt_off00013387.bin
03c94b387d9a1a496f92041b29c92fc41c55da005303628390f4b6a0aed50d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 10844 bytes