Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c78741fe25163c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 21:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 453008ad331b78426d21c6c2427ccf70 SHA-1: f0ab9763c90e0970ad553f7f2aa6dbfc2c1baf97 SHA-256: a7c78741fe25163caac1b7bb26fd460d7253da301978daa7925c30c05f80a7a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to disposable hosting and compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=iptv+smarters+pro+list PDF link annotation
    • http://perchegouet.com/ckfinder/userfiles/files/93210848.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/73006829375.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/terozilezenivegefojopup.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/didamafe.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/xonaj.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/19177632216.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xewazedikulinururigufon.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/68972070181.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/66705968588.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/41982422518.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/pisokafipawupobudu.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/kisuvitamowubikinerujok.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76c0198c1---75480307550.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307d59ed0bd---mekojuvijuwinisimozer.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/rafopidopiwefewowiru.pdfIn PDF document text
    • http://oris-am.com/editor_up/41048170525.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/tinekufenezoxarebeti.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109130505575565.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/88396982460.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d509b6ed6d---18487778132.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-15/images/files/xopegibenoliwawun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a73d42f0---9449174.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/52710492812.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_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 10328 bytes
SHA-256: cbefda849837ba1e633dd7d7221c5a10ad477beea68446c7b67f52585b692ec2
font_01_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 18220 bytes
SHA-256: c436a874b4765f34fef4c7a4583fa6e4fca67399299f02a2c5e62c10dcfdc187
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1