Malicious PDF — malware analysis report

Static analysis result for SHA-256 116c4e7f60d63280…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 11:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f51a7532c890933a63da11a5d7e89b3 SHA-1: 796f21e4733beb634e2c7e70d63bc896e4c0dc86 SHA-256: 116c4e7f60d63280f42b6b5d839f0d699813120dbbd2f441231c83437ad329a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised CMS upload directories suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=competence+motivation+theory+pdf PDF link annotation
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jafaxeliwopenu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9f36efa7be9779fa57a3877cbb50c7b5/sekozigirejana.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/fodejoz.pdfIn PDF document text
    • https://usis-consulting.us/uploads/files/negefozoruxinatutorivobun.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/xadavufegugunaselidapobin.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/53575521899.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918c3b1deca---jemabuvijesugowu.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/sulovapotabosusavakeli.pdfIn PDF document text
    • http://ty-int.com/files/files/44108327894.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/sepenurinazikulajakokemoz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b14394ae2---ziriv.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077699b2fb04---31677977440.pdfIn PDF document text
    • http://idroter.org/userfiles/files/13296782239.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/iec8rfqjnkti0qhperk0c1d2uf/23611135198.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/xoferelovilesoxosezekazu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db91ce0eb56---48769068129.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/sarosawo.pdfIn PDF document text
    • http://didula.ru/img/file/4324685729.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/t9el29j8098nuloeon8do1b9i2/wokedugirotowamis.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4707_20210707020114.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bisuzavula.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8eadaf51---51345496295.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f73217ffeee01ad217e4404f3c91ba16/35281482875.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_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 10884 bytes
SHA-256: e62341f6a3b9030f6ee8fcad794c0202e08773798772030a7f1954bce907676b
font_01_sfnt_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 17528 bytes
SHA-256: abd32ea0185ef13b42b942809fa060e3a2bda5ebed1de66594d0e8aca586f7f7
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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