Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e869ea6c5502f41…

MALICIOUS

PDF

84.0 KB Created: 2021-07-08 08:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 67de7578ff14b9339a9881040a2361d3 SHA-1: c8da040a6a73ec1c6464a83942891875bd45a869 SHA-256: 4e869ea6c5502f41d86a9e1e82e932c52a4a0d1a43bdbfa67d6e9f30412d1006
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggests a link farm designed for phishing or malware distribution. The 'SE_CLICKFIX' heuristic indicates social engineering tactics to trick users into executing commands, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://inwebjor.ru/uplcv?utm_term=how+to+change+app+install+location+on+windows+10 PDF link annotation
    • https://samowar.ch/upload/file/natusi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608956ce9c4c1---67039904163.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0cadeb4559ee4f56ebbecc0c1a3d1c2/17199506182.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/84485921326.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/70562127853.pdfIn PDF document text
    • http://kleiberit.ru/files/file/13317680955.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/pajokojideb.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/en3d0sv27k5iocrtetmsr5r58u/17575742854.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/3352941466.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079087eef35a---xajobupugapewej.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/95050181334.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4744c55a1f3ec5a3a3cfa08edba10c57/xarerawibanirutakusatux.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0eb87bbb---towuv.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/nadafewufax.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/6041465592.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/80933025088.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uqduq0onlraco4t5ab3v7su7e0/71334830070.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4f4c73dcbe812793f527774709d25e92/50692929270.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/tiwadi.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/27543031742.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26350f24d8---kuvapowunoza.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae22607aea---30090194212.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/paxuwo.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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 10944 bytes
SHA-256: ee85891dfac04c99e318e976fbfbf3227d489839e13a41e2c8886abe552c7f56
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 16776 bytes
SHA-256: c2b06c2f963a76e03b7adf3d90dd4f7c5a4e47e3141c590c1e7206261d5ff05d
font_02_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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