Malicious PDF — malware analysis report

Static analysis result for SHA-256 8357ca9527289b9b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 15:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25225203fdc95e857edb91b4ba04ebc7 SHA-1: 22fbbea6d6dfb619a7a4379eb7868c727a029ab2 SHA-256: 8357ca9527289b9be08b7c83ad34dc411da5da004d2b486082be8e15252421dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, rather than displaying meaningful document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=nfs+most+wanted+apk+latest+version
    • http://studiotecnicoforace.eu/userfiles/files/79448573708.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/25038555833.pdf
    • http://rainhouse.kr/data/editor/file/1241042153612ff5e4e3b22.pdf
    • https://italvaping.com/file/tivubogejura.pdf
    • https://tyeetomsfishing.com/userfiles/file/bamofevowupumexufizanit.pdf
    • http://kfgame.snailgame.ru/upload/files/20210911224549.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613904dfe511b---birixowu.pdf
    • http://zzfcw.com/file/fkimg/file/74542075414.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e24d657c6179fe6f7752f5eaaaa975ad/90341983852.pdf
    • http://goghepcacloai.com/media/ftp/file/44101349473.pdf
    • https://ysh.my/userfiles/file/44289385315.pdf
    • http://jubileejec.com/userfiles/files/28776258077.pdf
    • https://edinburghpools.com/contents/files/3121899589.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/33502693878.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/13bd262d3331b12a519e3dc0afaf2eea/jajovabebuzesojuvobi.pdf
    • http://portalcom-b2b.es/img/user//file/_0015897001630928307.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b24357325751761bcf72619637aac974/senikopulidapesiwujizirav.pdf
    • https://www.truck-transport.com/ckfinder/userfiles/files/gaboxolenuvaxaz.pdf
    • http://leaders-adv.net/userfiles/file/63457746551.pdf
    • http://dainichiji.com/upload_ckr/files/kedufepepawutakuzopow.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_off0000b9ad.bin
264cc4aa0baf1242cd8f15c67acb1a17e9752ce103f0275bf1363020e2201397		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AD 17132 bytes
font_01_sfnt_off0000e647.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 16792 bytes
font_02_sfnt_off0000fe5e.bin
7372bcb8263442ebb0474d3eb832147545c1f86b087dbe85544a617fc192ced1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 10880 bytes

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