Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a2d0145b99622d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 16:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50093f86346ca108e5f248740b884a14 SHA-1: 8894e25402710c119f97a46c10cdd7a1b0407731 SHA-256: c9a2d0145b99622d6afa3b17f1e0c32833dbb201fcbd277b47f2869a9d504f70
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sanfrancescovet.com/userfiles/files/faduzuxomurimavowunul.pdf
    • https://shevtsov-art.com/uploads/files/77988264124.pdf
    • https://cuatudongsaigon.net/uploads/files/mikiruremav.pdf
    • https://rzfmuhasebe.com/userfiles/file/86632424064.pdf
    • http://www.workbythai.com/admin/assets/images/nokorij.pdf
    • http://scarpatti.com/files/tinojumedeweje.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/40166304093.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161371dc354345---gepesesa.pdf
    • http://reichspfarrer.sk/file/26585640623.pdf
    • https://akproauto.com/nbloom/fckuploads/file/25671275347.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139fad15c5ca---64879989431.pdf
    • http://adance0112.com/upfile/editor/file/96046779685.pdf
    • https://tezerwatch.com/file/upload/files/09-10-06-28-59-58.pdf
    • http://urjabatteries.in/userfiles/file/mabevera.pdf
    • http://dainichiji.com/upload_ckr/files/fotibawivofakalabifijab.pdf
    • http://vivatbacchus.hu/files/file/zosezaxajodugagutexobupog.pdf
    • https://autosaloncenter.com/uploads/file/xarabusobizabevifimu.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/9465604036.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff30e3b23---95357572715.pdf
    • http://abwlanham.com/uploads/files/wulesumipesebop.pdf
    • http://twozonechickenlasvegas.com/uploads/files/86547140889.pdf
    • https://rasathantrananotech.com/ckfinder/userfiles/files/83462956646.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135238922216---71210547445.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+auf+sd+karte+schreiben
    • 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_off0000de6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 16792 bytes
font_01_sfnt_off0000f67f.bin
8537da23c36975654c666519e15c601a8eb97e1a06c1e71218628d8185d02fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 19972 bytes
font_02_sfnt_off00012874.bin
6f23643e29a9dd0b104aede1061e41e331b2cb5656e55d264ab297ac649cd64e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 10840 bytes