Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea9f331b1ca2de2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 22:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da23b81b4df06a12349c3ce5c9b53415 SHA-1: 5843500959faeb02c34a0cecfb0cea911a8deaf1 SHA-256: 6ea9f331b1ca2de2449f80a9c7c14a556db57608839f5434afb01237ced80cab
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, indicating an attempt to redirect users to malicious content. The presence of these link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gima.ge/admin/ckeditor/ckfinder/userfiles/files/dibexogivufawiwemet.pdf In PDF document text
    • http://uforoi.com/app/webroot/uploads/files/galevowugimo.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/kosifofexizokidovisufezej.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/15105141681.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6a5459cbcb1b6cb9b199203f918a08d9/11144645348.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xajokurifoxiwagur.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/84571674255.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131abf1a7dde---45417371377.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/worexakawube.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/84879586469.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/82113622458.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/32872951491.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zenijenodadegipexura.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9bcc0db36d67405aef09ba3799fe11f0/30384902723.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/vebotigukipofezopuja.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/7193769978.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/nokepo.pdfIn PDF document text
    • http://plncse.hu/php_data/file/85315048250.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/nateraxanaminabone.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/wopiwefowogenopubemo.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/jidadakuxomafebetut.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/funerowokudepitobumiruga.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/6022395892.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/dofax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+copy+the+screen+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10756 bytes
SHA-256: 5c72a49a7fb5c54002f52125e3befcbf1e85c56b7de4f83fb8ed6a73c5997ec4
font_02_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 18400 bytes
SHA-256: 98525eec244b12d83c9b2c6a4e04324e563dc0bc7a129455160ae8e1bdcc14da

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