Malicious PDF — malware analysis report

Static analysis result for SHA-256 3799d1b6083a02e0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 18:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d87827b3b5b8a796b869b59a86771829 SHA-1: 851db7b5a4d075dc7b99f659bd58124dd13b3970 SHA-256: 3799d1b6083a02e0b1a4a17f7e10cdcca5dda7b04bf90b6d9fc602c78ffd773f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/081b9193852f08ab73ff633e338d59c4/xodawadilaledom.pdf
    • http://balone.net/_upload/file///zanevedunirubates.pdf
    • http://gdgom.com/upload/file/210918025341139660hn6566lxg5wt.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/uoadjr87smqakgms8dqnncgbe1/87717981181.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gilakewaliwodujizu.pdf
    • http://resurrection-life.net/userfiles/files/85597340103.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/reges.pdf
    • https://doosradashak.in/ci/userfiles/files/79769143011.pdf
    • http://agrocare.hu/ckfinder/userfiles/files/lufoj.pdf
    • http://cupta.org/userfiles/files/20210916031214.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/fokugimogolizerapezowop.pdf
    • https://triatlonshop.cz/userfiles/file/73872985968.pdf
    • http://uralinteh.com/uploads/files/73780515654.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130b258a67bc---30668697790.pdf
    • http://bulmarconsult.com/files/54824280958.pdf
    • http://nessie-vinylcare.com/file/jofesoxopefiguwinosezi.pdf
    • https://mk-sito.it/uploads/file/xajazenobo.pdf
    • https://cyberbirddog.com/userfiles/files/59466573010.pdf
    • http://unseretochter.ch/images/file/niberireliminosul.pdf
    • https://nexusmediation.nl/files/98282237802.pdf
    • http://studiospazioambiente.it/userfiles/files/tujudema.pdf
    • http://lpxs168.com/filespath/files/20210920083604.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144af91ed94d---83315586959.pdf
    • https://searchlink.org/userfiles/file/47907621493.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/wugopomo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dragon+ball+super+broly+full+movie+2019+streaming
    • 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_off0000e0a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 16792 bytes
font_01_sfnt_off0000f8ba.bin
008c7b42a049cf635a225b5b208643960a3625424bd4a242421181a2c74ab9ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 19604 bytes
font_02_sfnt_off00012b62.bin
1e7cf2e190000011b2fb634c61262b4139b851679bb7cead864c13bd17aa37ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 11584 bytes