Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a09168d5619515…

MALICIOUS

PDF

83.3 KB Created: 2021-06-28 04:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 292a2056a434cab3b7844b84bd4f70a0 SHA-1: 35e4499f36153aea23affa3b93d1c5f1c2eca765 SHA-256: e6a09168d5619515bf8919eacd0a926b51e5947783e92fd3d0345032e6dd1d31
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kpdb.org/userfiles/files/81300679438.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/torederizafidotelavigi.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a230e15ea1e4beca6660fd1a650cf11c/nowep.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb67e3f5f---98520710270.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085426e61aed---xanukaniwevima.pdf
    • https://dolmalatrek.com/userfiles/file/73682899027.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/cb0a5f285b4db20395d9792fe0838f95/38158439462.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096481ee9e0d---wobebugubolufirenop.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085236c7040b---75005768906.pdf
    • https://mides.vn/images/ckeditor/files/mekeboxulojevobireradel.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/48bsofpq7vscjgq71li18nb3d8/zoginiwunepunufebakino.pdf
    • http://nexxosrealty.com/userfiles/files/bokoli.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0d60b7b46---ledemurajovunim.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45c6cf213---venoturuj.pdf
    • http://animationcoach.com/userfiles/file/3364913378.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7143b68c1f0ae97bc6a5c46900117107/tevojepuramixenup.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/56229332940.pdf
    • http://metallpress.info/files/32369916954.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/mefurefasutifevaz.pdf
    • http://dokumsuzgec.com/userfiles/files/92303051300.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06c228bfc---vinajurewidomeremusanud.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077211c4d6ee---jatefonuradozikox.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12368f339---nevebipinuwuwudewuzetapi.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/mrdojlcbn99618hpn1rqlemn6q/19031708410.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=classical+conditioning+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_off0000e5a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 16792 bytes
font_01_sfnt_off0000fdb5.bin
e84598bdac53b524fd33fbb9e2ddbbbcb54dcdda495ef086cb551476e3e6325b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16272 bytes
font_02_sfnt_off000127d1.bin
e83d5d8add5eea9b01083723fb0b57b69007a2f8e5b8966e6149e047acc53b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D1 10592 bytes