Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e04b3d093cec17e…

MALICIOUS

PDF

78.8 KB Created: 2021-06-26 13:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 296482a94aeecc59cda28c365ff54bf2 SHA-1: 7e346e9c8fac2fcc18cfc4ed21d500541883dc83 SHA-256: 4e04b3d093cec17e9b2673f045ff6c6fd2da101b93368607690c22478df8c815
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites. These factors, combined with a high ML classifier score and ClamAV detection, strongly indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2fa66751---pemosodejofenemobegid.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8138mh0rjuru192l2oi262nlv6/30468980801.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4c20b6205088b4e607ee630b6fc8b125/fupubavot.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/spmb0uju3ralajpk5qfcurqlvo/96180056213.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/wezapasefejetixuzerox.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/nafixarojudamosu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8t0b0cf47l658njojqijl9j9g8/kelodejutogolaken.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/jovozesazixawof.pdfIn PDF document text
    • https://bselink.com/userfiles/file/23332233012.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210504101342038174gamke5.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cacfadebe---93391802282.pdfIn PDF document text
    • https://norservis.com/files/files/86388469892.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/i2h141oj6n9ik6iatk9vn56v68/vobiraveladufobu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5ec221cf2261f0156d9869c2114f7f53/bafutil.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a029856cfda---wizizefuf.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/u39lck8nfv4enpm6i974edodm6/fowakoxef.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/569238def6e37c197383a1c62342ab56/4957644395.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93543809514.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c290cedc2eb9a2eb111542c1702df3b6/16530897107.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/punozuvipew.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a849f1aaf---bidojujiwoxobenekoram.pdfIn PDF document text
    • http://tele-video.ru/upload/files/53275586516.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/tuveromizeriliruraxilupu.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/fizurolevabagutatumi.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/fabap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=red+keep+3d+puzzle+instructionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 10816 bytes
SHA-256: a94bbd64b6bf39da92702eed05f102deabe612a68f0fff94e3356a5520343b2f
font_01_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 17464 bytes
SHA-256: 001035b89f2ac27109dd1f63259a9ef6a82ff21bf6fe5ec2829ce6b96565a46d
font_02_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1