Malicious PDF — malware analysis report

Static analysis result for SHA-256 304efccac62eb357…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 05:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4aafe3e4099e2bfcb62bd248c552e5e6 SHA-1: 2f019849ab75f50cfcc8c63ca0f22459969d4c97 SHA-256: 304efccac62eb3571f96b2e908b69e29dcbb5656ffcd48640b11f31daae30db1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggests a link farm designed to obscure the ultimate destination and evade detection. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://the-bom.kr/upfile/files/losobabumigilezudivemoli.pdf In PDF document text
    • http://skogsformedling.se/bilder_umeny/File/85177154559.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/35463039386.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775bcae5b11---pizip.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/61782170950.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/jaguzalu.pdfIn PDF document text
    • http://hongdacable.com/d/files/79561909783.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/vujat.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612adcc0eabff---75234083600.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4fb3f2d89---54442126632.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/debiwefuzego.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a6561916430fe0122b7e19389f092a68/69718313737.pdfIn PDF document text
    • http://belst.by/upload/file/40679314186.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/71470593465.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/60faab80702269c5b3aafc6ec22761cb/potamifabilozozaligizer.pdfIn PDF document text
    • https://areicon.com/images/file/jerojuti.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/12285405937.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde3970da9---weniromisanixozelijowa.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/salurapexajaxerinedekusa.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/46285573834.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/kategus.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09208abfae---migonanafoja.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/afe3e02c41b7f9f71099feb9e128086b/37265786953.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e010806a---85157877470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=followers+assistant+litePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 16496 bytes
SHA-256: aa3595da9a77a6640e02ebf276625b418a861bc2731109bea5ef55dc2a169d92
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 10164 bytes
SHA-256: ad214115c921a6a4d3517bb36330ccc75c6c8102c6fa335400e74e7a2881bd80
font_02_sfnt_off00010b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 20288 bytes
SHA-256: 5e98d5a1208b838ef4431355c2765909ea52b670717a4a116550d0fff2e9c074
font_03_sfnt_off00013fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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