Malicious PDF — malware analysis report

Static analysis result for SHA-256 427fdd86e1a108e4…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 22:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b14215d997fdc04b6bc8bf857eba42aa SHA-1: 6cc4fb91229d7bdf1060943e726c56c5d0333bfc SHA-256: 427fdd86e1a108e434455be0ef2ed24b46398f4ed392ba0c37ce27393465644c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/1oon4ea1f58sr0qnnf1gbkcb12/jureseje.pdf
    • http://brunagabriele.it/userfiles/files/5213979675.pdf
    • http://hkacca.com/userfiles/55423995183.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/bogufevabasapitufaw.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/455ea6deba008e199c3d42295965b9bf/96449541140.pdf
    • http://alpha-th.com/userfiles/file/78331758218.pdf
    • http://tano-cable.com/d/files/rirebojetike.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160771929e7a91---dusoveridasedoname.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rjcthkl00pu25jtqvhfd5djrcl/vogijelotokugibepu.pdf
    • http://kfnmsz.com/upfolder/e/files/20210625043018.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0e582a05a---44722874171.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ce832cd6d890343aa809e2835192a1e7/25795042180.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d302552094cee88080873571b08298f8/nibujil.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/46726a3b935758a2bb89a29aade31e8e/73790518404.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/sa4fj7r7cm82k4rqno8beok0on/19503343180.pdf
    • http://bmsorganica.com/userfiles/file/nikisenozegigi.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b268c1bf9a0---vuparaxenizesewo.pdf
    • https://777mto.org/contents//files/38604749981.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/zutijedofugoxirozalam.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091199335b7f---73449522305.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9tk1fuc2dvkd6hdobldm15rmak/20901819511.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7411df626---65419062666.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/t84938ol5gnttub5fuvvh7ed84/pexikirizeko.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cdb179fe089f159905199f21d4dfa4cf/53617814307.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f4b8960e8b284c1ea7a17368b254d957/47102820944.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=different+types+of+copyright
    • 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_off0000f1b3.bin
6840c4d1db85516901b9050b147009799d1601e78b0e271555e1fd8a35c72c95
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 17224 bytes
font_01_sfnt_off00011ee2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 16792 bytes
font_02_sfnt_off000136f9.bin
b73d7b121ecc9be70da53868d552d1947673baa1e371d7aa063c4dceba6ab20f
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F9 10668 bytes