Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff1673894afff5d…

MALICIOUS

PDF

90.5 KB Created: 2021-07-24 08:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e94c3ab3fee36b0fdf2a35f624737f0 SHA-1: a26ff831c321773acc87727d440da1c71b21524e SHA-256: 2ff1673894afff5db15f8defcc67563412f1f136ba2169eeb44f8f671f76b7fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://fini.hu/userfiles/file/gikivetibamuraf.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f297b81902---wulepudumepo.pdf
    • http://xsteelstock.com/d/files/dexomaludelupewo.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1dflt2s51aksvh4agn14std1jp/42088271000.pdf
    • http://doggystylzgrooming.com/admin/photos/file/jatowinagelipuwokupajase.pdf
    • http://vitaminyplus.eu/files/file/95789757066.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d0e8f55c---98419412720.pdf
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/59206605028.pdf
    • https://bonacorsi.it/file/17833783302.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/005dad0c5108e5a070070c35a9b57ecf/65475783920.pdf
    • http://scriptonica.ru/files/files/wivazipawuv.pdf
    • https://menu2uplus.com/images/file/97747678669.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9d9d8440af2eb9748cef0908d7562808/86171580561.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fd291d9a814f30087493a08ed4444e8b/82730705783.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ff549c92---xavisizulagorozurixa.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d6d8e26c---66705969630.pdf
    • https://best-label.com/upload/files/zajolusibifurimapewugobe.pdf
    • http://peaceinsrilanka.lk/userfiles/file/fimijizopuluruk.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e290e79a674a7b2f2dbab69917f746cf/wixufopurux.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7115b5c684---xelaluniliwufudoz.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfdfe8a9fc---latofazarinagagixiporiraw.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7672cde03---24246206771.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3541ef11---97972569035.pdf
    • http://itfind.ru/uploads/file/57083728245.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48ea808cfa---wanavokawonidutovedit.pdf
    • http://geombiagioschettino.eu/userfiles/files/70830286789.pdf
    • http://www.abraxane.com/downloa
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=list+of+water-soluble+drugs+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 16792 bytes
font_01_sfnt_off000111b8.bin
435261e2c7f1743f8320638757814ce3286b69534c0c0542a04f249151df6e85
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 18728 bytes
font_02_sfnt_off000142f2.bin
dce2791a77a6217aed1c4d916b73761098b79866e4b67e7cd532c92cf0f2f0d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x142F2 10884 bytes