Malicious PDF — malware analysis report

Static analysis result for SHA-256 955dacda50c978fa…

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 09:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 57fd0679faf41a0318f7ca42ad20d447 SHA-1: 974ec4d9acec45c279999289bb446e9a80413530 SHA-256: 955dacda50c978fac76074b0a3c5108db687e0de8a103077d4213411ed2fa00b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links strongly suggests an attempt to exploit users through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=what+colors+do+you+use+to+make+the+color+brown PDF link annotation
    • https://atlastoursntravels.com/userfiles/file/zudanefapi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d0f324f0---jedibavatederodoba.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bead1f7f3---20419106662.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160872432b1629---21523015532.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/pezawewakugofikefuxanajom.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a45e77865b72f692010c86877d02be65/rurofevenog.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/vinuwixakukexo.pdfIn PDF document text
    • https://promise-land.com/upload/file/vijuxulo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d20e1ef1688---94876421884.pdfIn PDF document text
    • https://hoalavender.net/upload/files/85344968675.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa90f7a787---jowosejirejiwija.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9fbc026c2---xomamuze.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/92369902648.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/begizupo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160782c26429cc---teritujedonef.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/vuluzabesi.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2af98796af333af4f1fc25bb6d571911/sanazem.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/depepiw.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/26444932268.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/29169ce1865f62be6311af16e255d0eb/58270268890.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/kebosozomafaronetunuvorof.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sk5id9tlrj71vv53aglcg0o3v3/52870109221.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/wetulaku.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r95dsnpk2n6df6uk4k5vkn2v4f/99598759524.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/772902hg7es191vc2reems8bp4/21698924973.pdfIn PDF document text
    • 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_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 11068 bytes
SHA-256: 6e201044e71d59c388ab01fafb46e77cb01a719e62061b8b70d95a12e0c42fab
font_02_sfnt_off00012832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 16516 bytes
SHA-256: b0ffbb8acfc4179c51fae998c51fa20c1960f5800d3bdc42ec5312a862ccd56c

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