Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fdfbefff1d9eaa…

MALICIOUS

PDF

81.2 KB Created: 2021-08-22 01:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0ea593f326f6774bcc5b31e9910f6b9 SHA-1: 479d1437e0b3dc9871038119140cb4e2e8f5c82f SHA-256: 68fdfbefff1d9eaa770cc078162aa12c524e62182897c7a188f9a315bac3a444
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ClamAV detection. The file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to external content, likely for phishing or malware distribution, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aulacvn.com/upload/fck/file/10626408962.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bba45a570---sijufodivoxolusutubuke.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608973743c4b6---93742123157.pdf
    • https://ekaplast.site/admin/ckfinder/userfiles/files/jojurekowev.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611300ebc1c46---46540765937.pdf
    • https://pianotuningdarwin.com/userfiles/files/24459073685.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0c817c15dad9d2e2b5399999d878e90/fomuvoxipadukinorivigu.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ac4e5272---39239471418.pdf
    • https://zlato-eu.cz/upload/files/50155584539.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85cacda86c---ramanokejasadamoneb.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9900bc5a3---63941769695.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/48e7210ba53a4833ceac09e3c214b0ed/66674331649.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afbc6a953b---goriragiwototi.pdf
    • http://clinicaveterinariacittadivignola.com/userfiles/files/wetumeluwelemilikezulosik.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160944c827ecb9---dudojolenuwujelopaxux.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f45ec41c---wuluwufiwuxavumufuseba.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1616c4818---40908575749.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c7f4090880d7fe2b74c97365fa68b649/80834366837.pdf
    • https://arvikabc.com/images/uploadedimages/file/73919704850.pdf
    • http://studiopiergentili.it/userfiles/files/61950918445.pdf
    • http://eviljoy.com/UserFiles/File/tosizatata.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/eb6c49416c3c68285f2db71d2dcbecb6/roxareniwunabovod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=delta+monitor+shower+cartridge+types
    • 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_off0000cc3c.bin
b394d780a89280bb89c8c88eaaf8e66c3ad7098df98d6872525510bed292c64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 18748 bytes
font_01_sfnt_off0000fc4e.bin
5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 2064 bytes
font_02_sfnt_off0001058e.bin
9174adc53182f43f4107b8e5e25c85986988aeefbbc2a473e88c6b1694d10298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 11164 bytes
font_03_sfnt_off00011f4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 16792 bytes

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