Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b120695aa8461f9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 12:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a1045a6a479aef3045c3027b69423fb SHA-1: 3588e43b111c4a293ff2cae9e9613fd9084c11b3 SHA-256: 6b120695aa8461f91e9a662be27945b1c44803d679755f56da22c1bd0273a89b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://crysiq.ru/uplcv?utm_term=collide+gail+mchugh+read+online PDF link annotation
    • http://pro-group.ru/userfiles/file/49897885646.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/kopesuzotewamoturub.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/v756rf98bfnckbotrbafmd8656/refitika.pdfIn PDF document text
    • http://artio.pl/files/files/78997441842.pdfIn PDF document text
    • http://plncse.hu/php_data/file/85315048250.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xelegosetik.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210902225122_cbbi6j.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/71397879186.pdfIn PDF document text
    • http://stylekd.ru/files/rokimefoxerodamajularat.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac524071cb---39920881326.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/21487175736.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/78659785599.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/22227813895.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/nemiritegivigugivixud.pdfIn PDF document text
    • https://duel.pl/userfiles/file/93747548663.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/lapazijigugib.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/37831719299.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/84303073252.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/toguvotavik.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9cb18eaf---2718083332.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6b036aabc1f1ed8773c808caa33c30f3/25973601119.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/23884905643.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/nidotisutozajobavo.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/durovebonisaxon.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210906144554007929c58m0.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/veliweromotisaga.pdfIn PDF document text
    • 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_off0000c249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 10684 bytes
SHA-256: f2a596ac9b52e5a0f76d095aae084be3a7812b57b1e847d2723e404a6936dbef
font_02_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 19288 bytes
SHA-256: c0480ba095d437790331853ce32101771b22d32a17078035a2a238273544cecc

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