Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e17e777fc2fe67…

MALICIOUS

PDF

81.5 KB Created: 2021-06-28 04:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 513ccf4cacae126ac42936bd7096ebf7 SHA-1: 91298ebfefc2906126d630b1b3fb43294a96bde9 SHA-256: c8e17e777fc2fe672c1eb8ff839f9169c4d776f450da0f79df78043b57154b19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body was unreadable, but the presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84345dcc8---83124539417.pdf
    • http://hainescentreasia.com/images/file/44451215443.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7phkpjdfm608ah6so9nmruq6g1/kifigukixekosaf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc41b98e9cb---budegigapotabuxudi.pdf
    • https://burlingame.com/wysiwygfiles/file/5378881153.pdf
    • https://cgeminfos.ma/upload/file/5001259990.pdf
    • https://topupdana.com/contents//files/welelevipuda.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rq81qiqnet2d58bdt4ffu2ai6m/60909614024.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab6b045d0d---moloju.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/92695919bead8bc613cb7020166ea9af/46073738141.pdf
    • http://bachova-terapia.sk/images/file/53239383068.pdf
    • https://bd-sokolovska.eu/userfiles/file/pinidisugun.pdf
    • https://europartner2.pl/uploads/figemotarowalalabito.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/87228931263.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f109e477---rasep.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe1d4dc51---48171235085.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7322c8441d2b7e3fa5af2f682e3de543/99944052822.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eca405f616970fc8f808588b1a79eb43/78205908899.pdf
    • https://manuscripthandler.com/userfiles/file/waxusa.pdf
    • http://csc0535.com/userfiles/file/20210628083336_pzfp4e.pdf
    • https://synodradomski.pl/userfiles/file/93324879230.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b578c480c1.pdf
    • http://recrute.fr/files/files/19544064468.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=black+and+gold+whisky+price
    • 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_off0000db21.bin
65d4eb7f901c906f2d26bfdf9574fa80ba7c831dc9217d7590a35e27903892e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 17616 bytes
font_01_sfnt_off0001087b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16792 bytes
font_02_sfnt_off00012092.bin
855e42e0df71366578480a5a568cc958e7a4f2543844530316f38eba6b9e8cce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 11040 bytes