Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67606414d6642df…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 23:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2dc1bb6c1ed02d739ed4f86a96626f2d SHA-1: c5760b0fda26047fe242cdaf74a45235f94d1d93 SHA-256: a67606414d6642dfb4f94623b7d9ea0f26204f1d9d8fae646efb23a7c8eac099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=ninja+creed+hack+mod+apk+download PDF link annotation
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/zudeb.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/dosapiperilem.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kazivuvulugufujosilesute.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e019d27c54---zepelagezodegebewukinan.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf09278ff6---fubizu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa19da6baf77ac0f64677d371059e2ab/xasegarupukokovidotiwuda.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135acb4be626---ruperipixoromoxewe.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fbf99296c7acfa01596543f8fb3297f3/fefawoxegabegutiked.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe9d5c0a2---40892731937.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/fiwedigojubatukakan.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/16359124509.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/51179451082.pdfIn PDF document text
    • http://marymo.ru/uploads/files/49035560828.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613763df1351c---63025196323.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/48183553850.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/silubaratigilulovakelijok.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/xupigedugodujunot.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/7759411296.pdfIn PDF document text
    • http://canadianrockies.info/files/file/gotapon.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/jenalutowafazaxolal.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/rhe7bprn3tsk2ii6nksr3vbupi/48057045043.pdfIn PDF document text
    • http://stroi-sistema.ru/img/vopofuwosado.pdfIn PDF document text
    • 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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 10800 bytes
SHA-256: 8ddf2ebaad8a541c1466c295809d8e80797a0e00834182018adc6c95e0869a1e
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 17396 bytes
SHA-256: a46438a6b3fc9527c90c7cc5e41ee9d9f17c42eed0430e30b8bf046794f4b71f
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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