Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8f67f025add957…

MALICIOUS

PDF

88.5 KB Created: 2021-07-18 23:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5020f35ff07dfc1a3121c7a8209586bf SHA-1: 246d7b5bd5f55dba892603950711359b37e23acc SHA-256: cc8f67f025add95796c7bbd4e8aad3b6dbb85dbb98b04d726b52e39bced6991f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://debschoen.com/userfiles/file/kijepeme.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc428c1b4---nuvine.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e5fd262e6---rofarinagul.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff76dae3a4---nufoginodimememevafamewi.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e280b7ab---60129749470.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/gitibolusurumutox.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6e0d9842fb5fe2c53cc642afcfc43a31/govibexitelunasile.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7b0fe39d5408a80491b0a8318e14e265/96960324825.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/doguxumulojonezumuwovilo.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea54623c8---94405207333.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160841adf3edc4---42917995086.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cfb76bce543230292a12d338654d6c80/sozadud.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/62354a8c51d13ce588ae586056ead458/riwojezag.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b49b2b55f---jexakewo.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc29c433b3---xosozexakolajanokano.pdf
    • http://archi-m.ru/userfiles/file/bivuxadojozojoketivejux.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce7827a060---lorijujikep.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3de8ced60b---77220315322.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/32792580752.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c95aace9e62---pezakot.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/40a77feb29c87b900a3aace9f72e3b29/xotet.pdf
    • http://apexnepaltravel.com/userfiles/file/83149484035.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e96fcdcb9a682a3b333fcc902a155878/gojurifojetujati.pdf
    • http://haiqi-machine.com/d/files/pezoxidadoxunibomafewe.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d2599df4---zurarosejezilizur.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/225574c3b59ef32426f3de46c9313179/23635752217.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/mejewarexuregabolaxumipuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+country+currency+list+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_off0000f453.bin
eccc172ed88a55253afa55c518546dc3eda775de1bdd899732f0fa8c6a523dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 17640 bytes
font_01_sfnt_off00012224.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16792 bytes
font_02_sfnt_off00013a3b.bin
68517409c93650a4757f3c7b317ac32a7e90bcfae37db4fd522009e9086f2169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3B 10644 bytes

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