Malicious PDF — malware analysis report

Static analysis result for SHA-256 3041f3e50bd13c55…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 08:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9c7490c065e3b6bdbeacc8a151e6811 SHA-1: 4172ad3f2223e53dd1f41c569fd2f6af4e6bcc22 SHA-256: 3041f3e50bd13c55276c75346e9c41f834a0d98276f204b0030a1991523c6fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=hockey+nutrition+plan+pdf PDF link annotation
    • https://groupunsur1.com/contents//files/53793320508.pdfIn PDF document text
    • http://josquin-capella.de/download/jamesaka.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42ba710dbc4aa420e301886f8d722242/42917148442.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/dexajiluwu.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/tuwezi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27ce785ed---vaxelikiriponujog.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/81777457413.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/83309717909.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/lodudotizifolotovamipubu.pdfIn PDF document text
    • http://geoman.cz/data/file/wanukeba.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/29iesajemgq9chjd0d906j3e9a/jizakebik.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/92094930360.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/7159005102.pdfIn PDF document text
    • http://newmob.it/userfiles/files/9541588408.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/dufimisawagibuwizojavo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161033ab6953df---4685361379.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/nelogesapegejazijavilej.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/26167425977.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a335db8ed3---38688182343.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/tisefekoxe.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/roxulukodegexiraxagawowo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341c5a8cf04---53099231075.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077acde9eab8---27075004156.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c10f38d3---fexuxosatujitel.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_off0000c1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 16612 bytes
SHA-256: d57579e46f00ac422d4297cfd4f2b150f1b5f84098eab6a4cf3da0860826ddab
font_02_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 10744 bytes
SHA-256: 19874c1273446dd8b98d44dba731bce5b0e22b29afedf676e75652f99625e21a