Malicious PDF — malware analysis report

Static analysis result for SHA-256 d544f24456a91440…

MALICIOUS

PDF

111.1 KB Created: 2021-07-31 10:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94b40ae490c3f5529eca0bb96243b6c2 SHA-1: d6f2887e255b7b6bb0eea8671038e1ea56b52f2f SHA-256: d544f24456a91440d3e116de93179870019e25f8a033563d91b8e8f2d994875d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, for being malicious. The 'SE_MFA_LURE' heuristic indicates the document's purpose is to trick users into approving a multi-factor authentication prompt or entering a one-time code, consistent with credential harvesting. Numerous URLs were extracted, many pointing to compromised CMS upload storage, suggesting a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c974e012499---8833315275.pdf In PDF document text
    • https://nstyapi.com/resimler/files/merabavakemawilesewovek.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/dafowubuwasix.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7a46aaf2b234e58ae6b636fec9ee826e/dejexijaju.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jazogosexososa.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc0b8361c310f333b2a538b9ef233e06/vumagujej.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/wiwazatesilar.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161003e3b557d4---xilofivomejafexujupes.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/50434935743.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2193b17598---fekogifofokunarumuriz.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99bc46b3cb---vomukoxexewudagodoz.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090348737d15---walekekuwilize.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/46467003161.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/33649591995.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/15f135b4b4241c5c914922eeab35a8af/44635547718.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pudunanamesexapasewiwugi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb9ae31cf---19716594207.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae6c1c8f5c---37326331102.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/golusilutadabumuvax.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c6608fcfee9c566dc67a2c8ab319cecd/11192390967.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082dcce504ab---62559564070.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5e49506b4bd9fb427aa05c3f294601eb/95441395562.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b89680b7f---nuralibefikumagivojamikup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+authentication+code+sony+vegas+pro+13PDF link annotation
    • 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_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 24676 bytes
SHA-256: 10f6aab22516e3775251840c51992a8ba6897a9a10a321d81304e6780601bd6a
font_01_sfnt_off000158aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AA 11384 bytes
SHA-256: f314340c6707cf9886644bcbc6171bdd48f46975af794b51fc0614b4761da80f
font_02_sfnt_off0001735a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1735A 2060 bytes
SHA-256: 7c7cb7d03afe0f2fbcc8e2a07f32732389822db9d54318a603e4b8dcdd594d6f
font_03_sfnt_off00017cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB0 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_04_sfnt_off00019229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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