Malicious PDF — malware analysis report

Static analysis result for SHA-256 42427162cdd4b271…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 23:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 74161aa15303578e2e226ad82523adf1 SHA-1: 6cf7b64a83e764af20704ce2d0eb434445c81524 SHA-256: 42427162cdd4b271621396cef2172777b0e0326d0afb2eb1f2fce780ac33e272
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. This suggests an attempt to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=how+do+i+add+storage+to+my+phone PDF link annotation
    • http://soc-in.com/data/media/files/xewujozo.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/95376764864.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/ranozuwuwudewotuwuwe.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/fenijudugaserewokilebenap.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b45b657b7---39908123444.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-17/20210917070601246808.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/63212bebfe0c7bfda314b24962fcc9c0/xuzek.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/34337724343.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/11018272868.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/31237749629.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/tegak.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/zupumig.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa010455d---bopalevusa.pdfIn PDF document text
    • https://fuoriscena.eu/file/zufovinejabilifukago.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/g36r4st7bo3qcq0ptqeuhadqd4/43985167991.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/doker.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365d6243118---62394915772.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/rumitufotojajo.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/38076164420.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/62636112680.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/3364196101.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/73305559894.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_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 16828 bytes
SHA-256: e6a734f92eec51165ef580e6b7cf22fb145f0fd407bf27441d3f3a82f3218adf
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 10984 bytes
SHA-256: bec976bffbcb245da82466b7b6b3d1bd0dcd4e9cf43f42286bf5db745555c5eb
font_02_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1