Malicious PDF — malware analysis report

Static analysis result for SHA-256 b226de4385983c2a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 04:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8608fc563a783000e529cbef8cf31e9 SHA-1: bc47989ebf1252540d79eb7c1323b87d83a811a3 SHA-256: b226de4385983c2aae5a344e078209fea4bec129cb94d76f36ef1c9c75cebb8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pixomot.ru/uplcv?utm_term=download+yugioh+android PDF link annotation
    • https://iqmuseum.mn/uploads/files/lodidatifenowijupabux.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/kusor.pdfIn PDF document text
    • http://grotech.in/userfiles/file/nuzupuwazijojezujox.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210908_A9A2BE18DAF24ADE.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7d838c5b3---26859436548.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/duzabanadefomiwekotanas.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/xixidadaxen.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/xuxivepixafakazijob.pdfIn PDF document text
    • http://congtyvima.com/images/Download/75324190830.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/jatotanaxiwasoperud.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/refajotugowozum.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/18569380169.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/zazulepuliniv.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/japodatagaz.pdfIn PDF document text
    • http://happy-land.hu/editor_up/73660167027.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/954005a4d914fe8a89f2af389cfc2e68/xejegiwexesolemejesij.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/40758842696.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sufej.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/xoxoxum.pdfIn PDF document text
    • https://regenerateacademy.com/file/39454564742.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/mebeliwekeb.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a8a8b326581bfe12d78e6bd0c92d3f68/74056616388.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/86452371561.pdfIn PDF document text
    • http://elskenecologie.nl/files/65439548426.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/30858383348.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db217b80ce---wumulixejojilimalenex.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_off0000c328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC328 10428 bytes
SHA-256: 3c811b11613d75b90c983d8db06a1cbd41a6e0150bcb37474b1d316485d39e64
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 18792 bytes
SHA-256: 03f28a6e3b0f649b77adf302af50b23654b6f349364611c0f123c2d3aa8ee6f0
font_02_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1