Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabaa5ef9a91840b…

MALICIOUS

PDF

123.5 KB Created: 2021-09-07 00:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3944449cfc55439667e75b87e65ab18 SHA-1: 63c86c4b7e032fbd0e077387f7e3164db74a45d6 SHA-256: cabaa5ef9a91840bcafe61260895d45fd31436de660f609415754e18fcdc8395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to websites that appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The document's structure as a link farm is a common tactic for obscuring malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://surtek.biz/image/files/20150121_132909.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48dfb81579---gowupobifuzepujokenubi.pdfIn PDF document text
    • http://airmon.hu/images/files/suzebuduguxusewekekogu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/gmlcghmh6pncfenmr26sft6dj0/betonosamexalufalekarax.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/joguvef.pdfIn PDF document text
    • https://purefeeling8.com/data/file/13784894650.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/fexikoruvi.pdfIn PDF document text
    • http://alkanboya.com/files/file///nelanafa.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dedb26b2945---kozamiminimafexufoluze.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m693pppk9tnl8ig1d29ncg7o60/38606560282.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c4e11a9943802883d2df90036f95c1cd/vazinavukom.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/94trsusp9je8j852etsvlppfb7/43245128187.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944178ad2c5---jufidimukaxa.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/gajotuwerumurezijasatu.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/17841361061.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/11577045296.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a1df4d15d73c3bfa1310e5b9e66eee7e/3446797117.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/2937622739.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/11982ddd7186a131ab29cbc70195c584/vafizezibimosobuzikuwa.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7efb3ae445---76860737565.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1a2bf071---kepazo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0b2133d68a0dd9ba93e564c37bc256e4/sajavixi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a723101fccf0ce010a4296706d543f45/67007763662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=practice+teaching+portfolio+pdfPDF 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_off00017c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C20 10732 bytes
SHA-256: 0c0f5ed742d584ebcff559200956ddb09ccb05e3d493fd2cc31a5ab463d50cd0
font_01_sfnt_off00019473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19473 19740 bytes
SHA-256: a738bca06c4b4b8df5a0eb226ab864bc50532c8800d4444cfc2fc0f3b5948e59
font_02_sfnt_off0001c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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