Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27043cd58ad8888…

MALICIOUS

PDF

102.5 KB Created: 2021-06-25 22:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bad2fc03e3efbce38d1c13043ef6c50d SHA-1: 42252e6356f43a8af019992f5ab1b6c30bb2ac5d SHA-256: b27043cd58ad88884702f48c884e6e7547965ffc7173b3f786a1b27509cf7431
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=the+physiology+viva+questions+%26+answers+pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a12c8ac5f89fb2f0f903cb7e3d27451a/lubaxisenasewifupadoxeja.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/2cd084fc911ea8df04a8d96e65fc271b/sipasez.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2bbd22abf---padasuzojofebovebij.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a34638944---ruturukulixe.pdf
    • http://honyi.tw/ckfinder/userfiles/file/85210488597.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/89215192472.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0291f8f4b44bd4d93d9a71c612ae511a/14900570980.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5f1ed7a248cde0cbbbf7ee0e8519e935/xazofikemuw.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0fe384bad556583049480eaf85d8a179/biwigunufajuzi.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/4u4a6uq99bqpl33d87eorb9n56/1778378206.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/84dd6a45c182b394a249eb25e80b23c6/kafemuxejukimoginiwotema.pdf
    • https://securityguardsupply.org/php/uploads/file/32107233735.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/73b781224f3fb40c9041512e7bd16fc2/15509866358.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbccba23df---4862333441.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/r01dvaqad28fmcpk6fgqvj3a00/66139462066.pdf
    • https://colakcivi.com/userfiles/file/rusekifup.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4f1846ff700b2016cf707bbc5776c619/nelurupuxunu.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958836164a2---92034544053.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10a467943---gofubobilitipegujat.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o8t439et9t4c8p4b2m0llqu964/29994906934.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1cfe036b11f6799b3b90dd570d1d22a9/79855520894.pdf
    • https://songhong.info/userfiles/file/zerepemesoji.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/00485c5e672239a9c6887084bb36dc55/nijifokukasol.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c93849c7188---jevupevuxesugamolu.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_off00012b17.bin
b3030386c3447a3f3e9410971ff4c87b1c8b9f5f9c7738613162e766afaa78d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 10820 bytes
font_01_sfnt_off000143ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143CA 16792 bytes
font_02_sfnt_off00015bdc.bin
5cb9bfa7ae7f6697939af808c00bde04602d626ee287a27f3e0380da2c68f4f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDC 18444 bytes