Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30f385e5a8c6f29…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 08:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 35feaf2c3deaa2daa8d36d7a3043674b SHA-1: 2676fe6d4afb5287100e622ed20750490024d14d SHA-256: d30f385e5a8c6f2928340504a4a6e4a5e53ceedb24ed4e4a1d59fd79bdc48a87
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, some of which host further PDF documents. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://atputasbazes.lv/images/userfiles/files/53240623729.pdf In PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/24555621243.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/69663156390.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc380240e9---lobojanaxone.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15244774895.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/tefod.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090115540236.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/17146510125.pdfIn PDF document text
    • https://12waktu.com/contents/files/48827441664.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/guxolujibawelenomobez.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/jemodejonitilokejinak.pdfIn PDF document text
    • http://prograsifkalip.com/files/ragabewesogimenukifa.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/wazatoluf.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/73188690528.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/duzomagifib.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/56725009601.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130169e8983c---vijevumid.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/99340006625.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/57354794472.pdfIn PDF document text
    • http://ewtch.com/upload/files/dalexeruzabisiwu.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dobovox.pdfIn PDF document text
    • http://hibertek.com/image/files/20210908_145728.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/639d3410d8ab73e24f12190bd9c8eaf0/xuxewodudinejawexat.pdfIn PDF document text
    • http://gro-felix.si/uploads/48171935138.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/ranajunudedepigok.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff9306db7---pezinegivilomejivifokizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=internal+storage+running+lowPDF 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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10420 bytes
SHA-256: 6ee59683fa9cb6ea9bdd96587cfc7718914ea1ad7c1f533b57a86acdb191b33a
font_02_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 18128 bytes
SHA-256: a3de38b50c90ae1de22c98b4f9ce176e3c4a5ac03eaa1b9ef04e2913940e9283

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