Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cad81e96425cf9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 17:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a5b3ad4de9cc185f0e89de52d760e84 SHA-1: dde37b02148005f2a9dad5ea97edabd5779b7e86 SHA-256: 02cad81e96425cf92ffa93672c0ff6c96e15931af99ab072be41d382f97ac705
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the link farm nature and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://3qlohas.com/CKEdit/upload/files/zomepix.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69cb1b967---dobifavafesuvovamekabirip.pdf
    • http://emeat.ru/var/files/15630379345.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607496fb25e97---66256536514.pdf
    • http://kulturazebrak.cz/userfiles/62058131618.pdf
    • http://garderoba.sk/images/_file/wuzepideru.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c60b8c144038ce0c3785a149468a7f95/55917853194.pdf
    • http://snap-drone.com/userfiles/file/xarojixedis.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5a0a6ff6192e55320ff12886e3e6603e/92490673710.pdf
    • http://learnersdigest.org/userfiles/file/24560776042.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7722a2544e---xuvekivititonefefozuz.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/81c0b19a15d24e1af6ad0950986c2f60/87694343735.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d59e8739f6d1711b7ca38eaf3ecda213/64134555786.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/njt8lofos46vrsi5k4iahujk33/62196008509.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/gakajujigogemuk.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6db32ac9d1783b0f4bdcf597031a3ee0/verabobesidefix.pdf
    • https://nestaerospace.com/uploads/file/3653188069.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c6clcgd7hc5n8m3j4liapu9p2/tojolubabevatopuperido.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805c0ca6a---12122108695.pdf
    • https://semineebrasov.ro/printuri-fi/files/99533152752.pdf
    • https://its-bulgaria.bg/files/file/52583189857.pdf
    • http://sahrugs.com/userfiles/file/41168290343.pdf
    • http://cohensevents.com/clients/74638/File/89253350507.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d3117941ed6e463dd1b2e44f82b68b5/41909850942.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acf429eb5b4---71072045327.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+double+fyodor+dostoyevsky+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_off0000cb3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 16792 bytes
font_01_sfnt_off0000e351.bin
cae2f84dfed67f495dfeda79b38b2af79aa16e6b7dbd87a579827c020547116d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 16312 bytes
font_02_sfnt_off00010d16.bin
641c34dd8d61baf445b4774d266c958cdeace6660b8d07424831263fc82b0ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 10712 bytes