Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a609265c679c16…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 04:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cd3673d086b354b78c5b5799bb380857 SHA-1: 79807bac2000bac8951515035c11bf240e023651 SHA-256: 33a609265c679c16367fd111877bb72795a6515f2e14b9e0fb4c1f8fb1415198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=download+novel+tetralogi+pulau+buru+pdf PDF link annotation
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/lisomagituxoxubelogibum.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/lewekurogitabaweler.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2i2jnmu6q98ecl75bp6sf9v944/30903495624.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ea5b06f8e95166ef6e2325af63bfa7fa/fetaxadinaxepuxo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124288ec3662---26031392631.pdfIn PDF document text
    • https://agatanorek.com/files/file/zojupebegilarunejuseweve.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/22def65b9b274d3d9ce125f34829ded1/xevivotesupezerewelo.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/85776316255.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/luus3ed2bd9ltrivl4i8ugvngd/kelatalerej.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/34445977300.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/wukijed.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/e2v6qfhor2j75jn8uii55g50tc/26009508809.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/49385494295.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/53842827396.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/kjbiv8lp6m4htvlldsa3ujs3j5/54118027448.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f892b622952c1fe0d85b2f254534d825/muzod.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71702642050.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6d76b095d7a60148b5caafcb5acbc340/83486587752.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b3601919---57919280713.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e80e2853063---nurogeniwipodewojovuwik.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/73064819539.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/16915830412.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_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 17252 bytes
SHA-256: bbbdb730b7e45d24ed3857b73e2699b7394e0d1cecc3a3266987dc5b23002545
font_01_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 10896 bytes
SHA-256: c4150d0ea182a739ad353e5523ac2af5d95399da50d1306d228fafdc9cacf2f1
font_02_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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