Malicious PDF — malware analysis report

Static analysis result for SHA-256 abacb4e31dc1fd27…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 12:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7da353406eda5236e72725566b4403db SHA-1: a21bfe4d2c0ca9809312fa2c79bb750c741f8fd5 SHA-256: abacb4e31dc1fd2713e0258b53b6587c61488361eccfae82d3f850192e47421f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=putlocker+far+from+home
    • http://stauarchitetti.eu/userfiles/files/37796240558.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161358c50edaa5---50319211450.pdf
    • https://morganmethod.com/ci/userfiles/files/52562439145.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/65974243763.pdf
    • https://peltonfell.org.uk/ckfinder/userfiles/files/sovimatavenenevodezujoku.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cc584778---99718780849.pdf
    • http://pjzhengwang.com/upload/file/20210903_044417_132.pdf
    • http://zjbfjt.com/upload/files/26503579782.pdf
    • http://35ct1.com/images/ckImageFiles/files/48299089903.pdf
    • http://autofox.lt/ckfinder/userfiles/files/rojobefokovet.pdf
    • https://geniodelweb.com/file/73910378086.pdf
    • http://ambvetfanini.eu/userfiles/files/woviredibobare.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109041853212839.pdf
    • https://perkunasstudio.com/uploads/files/202109061420167810.pdf
    • http://hnsunnyfood.com/d/files/72096646516.pdf
    • https://yuktogel.com/contents/files/79124568900.pdf
    • https://globalathena.com/ckfinder/userfiles/files/lobijefuwebepusebibatale.pdf
    • http://architettodrabeni.it/userfiles/files/zesameviwugeje.pdf
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/94418562735.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394d627c026---mivixizenifujuxixepida.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_off0000c72b.bin
7abb09da23b750ce6f3f2c12be3a7ec58a741b1143ad279b951a6acd106443fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 18032 bytes
font_01_sfnt_off0000f675.bin
ef71d5a2db31568300ec4a96480a9f8413c0089a37e5b59ab7f8f73757bb567f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10428 bytes
font_02_sfnt_off00010e30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 16792 bytes

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