Malicious PDF — malware analysis report

Static analysis result for SHA-256 4345e9992cc37158…

MALICIOUS

PDF

90.9 KB Created: 2021-08-08 09:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79c6be81e4c3aead20628e4e2b12c617 SHA-1: 5dd60e5026dbe837f7607c5f3c41f7239f8aacdb SHA-256: 4345e9992cc371584a3473f69c611508771aa2cc53618096fc8a0dcf32c9f8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=angle+of+elevation+and+depression+word+problems+with+answers+pdf PDF link annotation
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7b4b95da1e5db4d3acc357c2553b76d3/tigajek.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed5c43a2011---kuxewawudelilifab.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e509522c705---waxeludinonujojubori.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2nftq3qq1cl50a82udjq82ne04/37879833246.pdfIn PDF document text
    • https://scriptdd.com/_file/file/tefagenuganabixiw.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa108c5c7---15900901962.pdfIn PDF document text
    • http://digifast.cz/userfiles/91134831234.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608242fa12955---besasufabevivurop.pdfIn PDF document text
    • https://dacola.com/upload/files/selasuninoxewomozivefi.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/baziwofiromimonoditubosuz.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101248202230.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e479b05e2e---49671583618.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/zoduvorasiladofubotuvijo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7lge8a3fi6i6nk3n7d31ljfal3/28400825521.pdfIn PDF document text
    • https://bor-diing.com/upload/files/nevisazolog.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/23015275921.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/v7fr73sch09dej6ul72hf5m3kn/dagiza.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/350975de846d61408f581a0cc0121d17/86133104702.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc301708874---savivijisixig.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/68ljep7j2j0dcnm0mo0u5i6jep/25323758849.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/83241698167.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/movema.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/13282318382.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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 18192 bytes
SHA-256: 68fe737e779f29c8716e211fe5883d7d39d167857916a87ef8a5a896929fbcd7
font_01_sfnt_off00012873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001408a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408A 11216 bytes
SHA-256: 1c334bfcadd40cfa6b1c8f91c1854fcc3fdb9d3ad7f0a3a685bafe3c8c65c720

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