Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45fba2668321386…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 21:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7b95912b64b1b230e8c96c92baa3643 SHA-1: 4c7f36ef762b085dbd44142dcd1d2de7b59a1418 SHA-256: a45fba26683213868da16496ed5b27fcbe7591badcb106813c364ccc5edbc214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's likely part of a spearphishing campaign, attempting to redirect users to malicious hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=chronic+kidney+disease+guideline+pdf PDF link annotation
    • https://farmaciasacoor.com/site/upload/file/82066042786.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/fezofetikedinedaxasefezu.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/14441206811.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d74b74cc48c---vavoduxaku.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/8918k0bd05be5okhosdgpm7oj7/farofifo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/35765134080.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/9807431036.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/2449185664.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/kividu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf00d4b1d---fawuxagulerobo.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/99142775207.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/82188100710.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/larosiregikolumesowo.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210903022937.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/nabofijaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f31c223ed53---wodopilevot.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/54721743870.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc77f7436a---13379311999.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/75623044765.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/5276845049.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/80016220375.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0ggu9t2t786p30hnebhtd9ig0/54332037745.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/12627449453.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/rixikifuw.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ecc8dae9---76178139633.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_off0000bf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 11140 bytes
SHA-256: ab9f0cf69c4757bf00989e025b2c3a3e84c3a01232d2af8419924029438b9a7b
font_02_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 16320 bytes
SHA-256: eaf2b470f539978e0e96b529ab1bc4395aadce90fc7dfd79bddebc556b82b483