Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc55ec476abb044…

MALICIOUS

PDF

105.0 KB Created: 2021-07-07 14:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e9a2324f73a49c56175d800107021f0 SHA-1: 708f3b666a3f61f26000e2116f9de1606c342117 SHA-256: dfc55ec476abb04413e46384d7644da654d237f830ff931a580be3044729f9fc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/42672302ae82b5543a5a94e2a907c32d/74015893435.pdf
    • https://mytekas.com/UserFiles/file/tesekuxebogesesiveg.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf547d13a71---gozedojonebi.pdf
    • http://amctop.com/board_data/editor_img/file/202105241857.pdf
    • https://vieclamday.com/userfiles/file/73840904643.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80762c83ad---kutigubatikowejozavimibaj.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/tufeninigixelose.pdf
    • https://responsible-tourism-alliance.com/content_file/files/59505988381.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/adc55e1edfbcc768381a270b51c24dc2/jokepuvaxodokixomimot.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5ae3cdbd74ce42950af5b4783c98937a/jemebugozomaj.pdf
    • http://rotang.net/userfiles/file/85945401527.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/l33nf51u5ev73sqtnu66h0jfia/lupiw.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909bc45b180---jovibawelinow.pdf
    • http://agcslohian.com/userfiles/file/zepuviserawuwekifi.pdf
    • http://muaah.ca/userfiles/files/titupagolekedeseku.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0b17165614f3e1576cfbc52c877e20cf/108504023.pdf
    • http://kirilmazbardak.com/userfiles/file/75000649643.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d0f0029d---lezudaganoso.pdf
    • http://georgekoldun.com/var/upload/file/29259901629.pdf
    • https://arte-salon.ru/upload_picture/sudujurup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hay+group+job+evaluation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013753.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 16792 bytes
font_01_sfnt_off00014f65.bin
b7a7629ae62ff23c27db1a6aa24ee07ee89d3e39a57f90e6b1d881eeadb24625
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F65 17980 bytes
font_02_sfnt_off00017e98.bin
294ae042ba33269c883dce1a84c527f0540ed5772f11db543ef8b3d3dfaba82f
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E98 10800 bytes