Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b9e19ae659e556…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 09:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 202c8f17e3711905fbac6ad513d6eff4 SHA-1: 58d41a3274c4d2a867600b7026dbfd315847b753 SHA-256: b6b9e19ae659e5567561d3ad70b1b7cdfbb2cbe124a8cc2197b25fd278fc2bce
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains a link farm pointing to numerous compromised or disposable hosting sites, designed to redirect users to malicious content. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://almar-bus.pl/userfiles/file/xogajetaxodetodikivade.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607309f11734e---33311907.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e6cf4065a8ca377223b78a5cddb24e62/47592251876.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d5e56c5e---21968393248.pdf
    • https://travelsafeway.com/userfiles/file/9246183811.pdf
    • https://syteq-pro.com/userfiles/file/tovedazipagidiw.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca446ed68---13606292331.pdf
    • http://gibisch.info/files/files/36252746496.pdf
    • http://arci-mp.fr/admin/File/tadavikekalufokajinenuk.pdf
    • http://akinmedical.com/uploads/file/52456570080.pdf
    • http://otvorene-srdce.sk/userfiles/file/zudodanufa.pdf
    • http://www.predia.cz/userfiles/file/25161952806.pdf
    • https://faresaldabbous.com/uploads/files/21821627386.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0c288afed78514232f3d011ebe94cb41/vukuzeligoju.pdf
    • http://highendschmiede.de/highendfiles/file/13380704750.pdf
    • http://cdmatik.com/uploads/file/pusofodizo.pdf
    • https://absoluteanytime.com/media_file/files/files/fafekenali.pdf
    • http://alarcon-v.com/editor_upload_image/file/32637374635.pdf
    • http://haiphongcontest.com/images/files/96601965902.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69e7343884---tederimovoz.pdf
    • http://www.sctiec.com/up_files/FCK/file/55947663346.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb2744ef97---28403882738.pdf
    • http://acpiindia.com/userfiles/file/50479478333.pdf
    • http://stelmart.ru/userfiles/file/23131739588.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=decision+trees+in+data+mining+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_off0000ce91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 16792 bytes
font_01_sfnt_off0000e6a3.bin
c077765ce76401bce9109b28b04e15b7f0ecee47adfdc7548a98de2335003f8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16620 bytes
font_02_sfnt_off00011192.bin
813d4ca7871c68533a75acc1fef0201ac4a71cd1efb513067d47addc7f8b6b29
pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 10916 bytes