Malicious PDF — malware analysis report

Static analysis result for SHA-256 aece07b691e50d92…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 04:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee3e8dc9f8cfb17185cfce59783fad1c SHA-1: 3c43d547cb88e19c15613574d067a18bfeced857 SHA-256: aece07b691e50d92261c8b312aa151c64a5dd04d4b83b621a739f08c9e5246f5
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point to an attack pattern focused on directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://almuhja.net/ckfinder/userfiles/files/nademivuzusimonitot.pdf In PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-19/20210919073824655553.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1fd5031f0cbdc6708c6f29e4998f38d8/simopozewejowudogodeneve.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/9910356566.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/88555325174.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109010832457033.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/nejije.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d934d9d6---23442360425.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/zuxosowuda.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/xuxazave.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613456665632b---62362377084.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/66070065587.pdfIn PDF document text
    • https://heyratacademy.ir/file/58327691075.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/43486485888.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77513539334.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/83985984101.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/zovazuxujek.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/koxavomaxuduzujaginina.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/63137639914.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/22791215967.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/831882026.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/28464174892.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/jamolotopo.pdfIn PDF document text
    • http://www.buildonhope.org/file/lojejib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=npc+codex+pathfinder+pdfPDF 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_off0000bde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE9 10584 bytes
SHA-256: bba78fd8c9aff7b83a79163827346d9dca447d617cecaefd1d2a32731192bb85
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 16760 bytes
SHA-256: fe98736429ed93f0f3016cb0e8363d553512071217d716d0b4cc3c1aae6e1642

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