Malicious PDF — malware analysis report

Static analysis result for SHA-256 640573e29acc3838…

MALICIOUS

PDF

68.7 KB Created: 2021-10-06 14:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d5a0f84bfbf6abeac20d88ed45b2278 SHA-1: 887342e549313bd313aa596e9715ca59217a3a2a SHA-256: 640573e29acc38386d6f3fe89bbdd01c9058cefd477e76172dc9b81312513ae9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to a phishing campaign or a downloader. No scripts were extracted, but the structure and URL patterns are highly indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=c%2B%2B+class+constructor+example PDF link annotation
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6900250b58240a90c3d1e0a3aff395d3/guravobejubifonodasi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/mulizimazexosu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2db2ad102f76719abaa056b5a05e13bc/36183275757.pdfIn PDF document text
    • http://bulmarconsult.com/files/xenijetemabixu.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/furusojifutevofaris.pdfIn PDF document text
    • http://52963566.com/upload/file/202109271432259362.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/52123954934.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141701dcff6c---97168249482.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/rozoxosigemikezupewot.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/93826830933.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/suwovutekazalupugavezej.pdfIn PDF document text
    • http://xfswchem.com/upload/files/jowojedukob.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/panuxopaxetaloliwulano.pdfIn PDF document text
    • https://birotex.rs/images/files/gevogapaninugese.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/9471609447.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161563d9e7291d---17576793194.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/f15v3tou7qp5jsg6lq9ojfupa7/winimawodajowuzedizan.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8558b4724---giwew.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/rolabiwinaruwelafaviwiw.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/15374252514.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/vidudopiviritokajen.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/27164714104.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/39717e49200821a3b37c16585d4f651e/91963446520.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_off0000af85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF85 14992 bytes
SHA-256: 1cf7e7614a19561be764009497fa84f2367a054f3fe2b24eeb6a2d19819d630f
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 10676 bytes
SHA-256: 3334758b798a785ba95421641c6157843388c3eada91801d320cdbf12d8e1516