Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ef10cb394a9276…

MALICIOUS

PDF

78.6 KB Created: 2021-08-03 09:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2cccb372ae30429b55ee233e9151e68 SHA-1: 25ee782b9a504e19d31c17d1c900e8fabd8eba31 SHA-256: 05ef10cb394a9276213064c3b778fed444e61ecaf6dcc79a330b8039d23cc8e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites, likely intended to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c3d06305---sopefujaperidaxagozugo.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d8e65fb27---29676840136.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/53758893590.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/50343553252.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/be59d0f3ca36e6e0925cdf9698ea67db/pexafosuginusi.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/33112774275.pdfIn PDF document text
    • http://edgecs.net/documents/mavuxep.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/26175190113.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nejefunulokiwevikijuzerur.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/96167029518.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed1851f1f---93059279136.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210708_F29CE527E53791DC.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/bg819r0c0k5g34qfc6lm8o50e3/vazudevadeleraror.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9d36b5b0cfa4e5e42273f28c251a8a09/vivamolunewun.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/14317171205.pdfIn PDF document text
    • https://12tiga.com/contents//files/totusobe.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7683fed049baf7aea4f5a7a4063ef6ab/tanovalepeneruvimaxi.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a61f9aeff594c31813dff570d47c5acd/mosuvopijotubasidelonexad.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/64656286140.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdd7897c7---71886583517.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kejavamejifege.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/1ukboge7uaj5kcusn440uqmij0/17723047987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ir+%2B+a+%2B+infinitive+worksheet+pdf+answersPDF 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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 10744 bytes
SHA-256: 0c8e0255c2f46b350768ee2b1d4155041e07baf5c44b53457990e4884bef6557
font_01_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 17916 bytes
SHA-256: 93de78356e1ee34b317421585b39314d38d7e35b5cd3d112077b164a16dbee99
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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