Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5972bf26c0f1f0…

MALICIOUS

PDF

86.7 KB Created: 2021-06-29 23:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cee3046d1d83d427c2f45124ce1f9e5b SHA-1: 275802cf0ac5865191be1133c70469c61ac4974c SHA-256: dd5972bf26c0f1f068e63fbd9d65009ffd285a9283bf7ede231c2032663a090f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is designed to lure users to external, potentially harmful, sites.

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 https://ketchas.ru/uplcv?utm_term=what+type+of+democracy+where+citizens+elect+leaders+to+represent+them+in+government
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/65351570703.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/18930bf62e386765a4387b0da65e312a/25706518021.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/palerakosetotexosopap.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094239e6fc8a---13877296873.pdf
    • http://budohurtsa.pl/userfiles/file/larelojedome.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9ed3eec11291d46ddf7898fbd7bb9933/13407554078.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7906498ab---vovabepumudize.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ccc7ad82f4158bf8b72be42763c3b639/1362483988.pdf
    • http://sanruou.com/app/webroot/uploads/files/xojideduwegijibakevifomo.pdf
    • http://fittbikese.hu/files/file/bezox.pdf
    • http://chrislahoda.ca/userfiles/file/63510903104.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3198d5a8a97793f07cb7ebd571794e60/10770001110.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41444529e---bazoteropenetuwatejedi.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f2ece5e1---14839597510.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nj0e5lk4iodjo4tm11teioipvg/mikiza.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087552db9b61---resoziwudor.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/64909704378.pdf
    • https://mangmalungtea.com/userfiles/file/zoponetafusol.pdf
    • https://a2designbg.com/userfiles/file/4674534075.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/zamoporewemolep.pdf
    • https://sankohomestay.com/userfiles/files/61876796773.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607210dd1f12e---nazeso.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512b28bf62.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687c25b13---9097424989.pdf
    • http://www.cafeinca.com/img/public/contenido/file/69939778743.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_off0000e986.bin
f0fc09b3b439bffa5f1e63cfae49d679aa78ada95c964718e4e4fb6a72d87c39
pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 17496 bytes
font_01_sfnt_off00011750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 16792 bytes
font_02_sfnt_off00012f67.bin
158a4e9b7e2c6cfc451b9e4255bae973854f1b39586bc0bf73ec8ee0e4950f69
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 11384 bytes