Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c4c8fea9b94758…

MALICIOUS

PDF

80.9 KB Created: 2021-06-29 16:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08354e31138f8f033232c395d80b16d5 SHA-1: 72e60ac704c09077838eef1eb3ee9da949f81cf8 SHA-256: 29c4c8fea9b94758dbc9d7b9fd4892b2f4102466e72fbb3878e119ef621e068a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites, likely to lure users into clicking malicious links. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0011201c7f3bfdcd4cbde5ba484709f4/82126935789.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd43d8ce9c---pafowibopin.pdf
    • https://equantumconsulting.com/files/files/divupesu.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5j630jt4a950fohckd0mm73l6h/66147703421.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/cd6f03efa0886976abb7b7c0576271fb/rupuzi.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078487b5d5f0---kejejanoguzigopabogojofu.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5f9f98d87b303a85f9cd30c11c1d57e2/2207101755.pdf
    • https://rmp-familienanzeigen.de/cms/files/jazawofivaz.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/70523380938.pdf
    • https://shidoremicrosys.com/media/nikaxumikarexosu.pdf
    • https://moveo-sport.pl/userfiles/file/varuxebezufarepur.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a81241a662b---tebogevud.pdf
    • https://astek-telem.fr/userfiles/file/13542886368.pdf
    • http://oodow.cn/upload/file/210617011238885493o1gfp5mb6n4d.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/837651753288e21e77a9dcd2e5999d5c/loxonokiwivoketu.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dfc44bb4936d1077ee25e0c8fe72ca8f/46589527880.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=henry+cavill+surprises+will+smith
    • 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_off0000d645.bin
a1cdad801fae8a6f184847afb02ead5ad075fb3e0bee3bddff9e63b5063f9201		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 17996 bytes
font_01_sfnt_off00010611.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16792 bytes
font_02_sfnt_off00011e28.bin
c8d5f6d21e6e0602ce3335b4b6f7f4425f99983be08fd82f89625d16a744f41a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 10876 bytes

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