Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7538941ae8630c…

MALICIOUS

PDF

95.3 KB Created: 2021-07-01 20:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b79aa34fc9c8381dcf68c06f3975c35 SHA-1: ae0ac99bf183000fd0ad4f62e518f0f709ed61fa SHA-256: ad7538941ae8630c46c59f2f93fd76521e4f5ce9930073989121897e505de2d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://allytemp.ru/uplcv?utm_term=among+us+mod+menu+for+android+free PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e897d6033---tizelabijudaxumemasibozid.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/8042782336.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kakubibuposorewivebozel.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n0oeusmgkncsvnjne2q3b0subi/55600250088.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e8ceed77---90704221368.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1ef03919---posiba.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160860601c117f---6879748336.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285bf640b9---20316389788.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/wixogid.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/95413199893.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a2eb7c068---94390639239.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1566c2b7---59700917815.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9240494c1e11a3ef78a8d5bbed7180b0/gukadisuf.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/rinexojizikamuxadi.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/74041979858.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098622012810---7711595079.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/debajoba.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/sanezopodosakeparekarit.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934b33cfb5c---guwaxojulufivepader.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e719e0e98a941b6dd46ed1db566b6c31/wuvisofabanewizude.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b6c43e5c547942530adea430f3860638/zuxatibuxegal.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cdfcbb69---41509663339.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ef7d4fe4---kimejedusixogafawaraga.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 10632 bytes
SHA-256: c88d4fb31400c367f284f1c813cde6536ba55e8ef1d1a6efec42b1288de69b8a
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 17808 bytes
SHA-256: b13265f76657cd1dceca46a217a82b0ef1cff551b1043fc6b1fef183d29c296a
font_02_sfnt_off00013961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13961 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off00014164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14164 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_04_sfnt_off000156a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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