Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f4d1e5a5884507…

MALICIOUS

PDF

96.6 KB Created: 2021-07-01 13:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60055960f0557db137992bb32b512a8a SHA-1: 073f79d1dfc56839c346ae592107c45ba17d860e SHA-256: 31f4d1e5a5884507688f6df1402738777d5931cbefae4fcb3757edebf00c922d
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into clicking malicious links. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://garglob.ru/uplcv?utm_term=higher+order+derivatives+problems+and+solutions+pdf
    • http://aisef.org/uploads/userfiles/file/file/90280155901.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40004b78d---movozagukala.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmjdi1ciqhcqa2e9gjnoit2d82/5511539908.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/daeabd2a530f082cbf854ab8a24679cb/vanigina.pdf
    • http://andlupa.com/userfiles/file/vifejoxeriroguvomovegaruv.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/j56ohkmkhfnq39ojfrvvec5b9n/fupegetatozol.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/1588a2af34b77bdb0d0969ebd19f2065/xevuvo.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1cff2ac513bd23e38cd0ae9937bd8c2e/64857389801.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2fcc28fd2---rimuduwewuwiku.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/lt2hntof6s3cib3neth715fq92/finagamufivebofuxutit.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced99301b8---zusamutazozivoruwi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d180aee98---34316978517.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab676a63f8---gelemopufit.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/917kr17rroo0rtfmugtr8mkst2/80801287132.pdf
    • http://poiskvod.ru/images/file/lixubajuzaw.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aed91698b---wonukegigopatap.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095b734bf0ad---gafogepasaxuma.pdf
    • https://chp-travel.ir/data/file/toleberuxenogawile.pdf
    • https://ocbond.org/userfiles/files/dazijafa.pdf
    • https://aawyx.com/sites/default/imageuser/file/5025776888.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c4505b180---37452464071.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/417239becb444ffbca73814268c512f8/nememekomagafojijiwevuk.pdf
    • https://ajansnigde.com/resimler/files/35724182875.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be02abc73c2---jotonujiburovevutezowem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 16792 bytes
font_01_sfnt_off00010fee.bin
f5f20dc52da6b3cd39f801c91d06a30da771a7246202bd5363fa0d029c77c369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 19856 bytes
font_02_sfnt_off00014543.bin
c9e4746fcf10a028dea1b4891d42967e54ced910d199b5c1b9dc61476cc5e115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14543 11240 bytes
font_03_sfnt_off00015ef1.bin
dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF1 16084 bytes

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