Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ddf25e8384c651…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 06:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66aeb07db9dd3881bf3787bd57e3bdca SHA-1: fa8f289abce53835a0c4d7d66f3abe27960b15d6 SHA-256: e9ddf25e8384c651378dada543af1549cf1d9b3833203f3c3b4ddaa2d14e8c2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the presence of numerous external URIs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd4db324a4---10460939878.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b079d782---38457986714.pdf
    • https://grandplaza.bg/uploads/assets/file/buvuraxotosofetomuwobudu.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/zazamuleb.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5c9330429f61ec7f54e466a813405ce0/42875626910.pdf
    • http://giaoducvietnamtv.com/images/ckeditor/files/xezudilexetatufasabokoli.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1b184c5cf11cc3d2a04c6a8df4ae6c73/jofuxopesi.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/vosoditegap.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609de946b9b8c---90490349787.pdf
    • https://grandplaza.bg/uploads/assets/file/45913427250.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/174g32q9598rk5qfgkd6s924ca/77603991931.pdf
    • http://newkontakt.ru/userfiles/images/file/fodovu.pdf
    • http://www.odnpoznan.pl/fotki/file/file/zemelobopobigid.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/026fuj2qkn1e6alrqnf05b9dlp/wiwuxixedakifovije.pdf
    • http://kokomo1986.com/clients/31029/File/71621788026.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612603846f67b---19534602541.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2bbb6139a90297e451790ef514358937/71269193304.pdf
    • http://backupcenters.com/userfiles/file/53208589181.pdf
    • http://capmar.eu/userfiles/file/84690636668.pdf
    • http://korytnica.net/data/files/96547728010.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/jikorezibuverexo.pdf
    • http://designpavelzapletal.cz/files/file/zigewo.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089322dbc2e2---felufevogusetujude.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=inspection+and+test+plan+construction+pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/6918758988.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_off0000bd45.bin
4ccc7bb3f324c2c66b748e42d0671abd3423ccd1dbebaf9c94219eb7edcd0c3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD45 10664 bytes
font_01_sfnt_off0000d5cb.bin
a19996165259b92f9c433d4b463d2b628d631dd057edae9ffcb520cc03d6abfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 15984 bytes
font_02_sfnt_off0000fe87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 16792 bytes