Malicious PDF — malware analysis report

Static analysis result for SHA-256 910d7b358473b3a3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 04:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 651ac16853dd39ca9afb98f98f72c22b SHA-1: 8e14b87ca1e148b9cc24a77d9acb2d500fcc62d0 SHA-256: 910d7b358473b3a33e6ed0e549a9b0cfb01b8a7b448c18af00d4a6ad477a564a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to various domains, including compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.2205

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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