Malicious PDF — malware analysis report

Static analysis result for SHA-256 817367f03f4704b1…

MALICIOUS

PDF

96.4 KB Created: 2021-06-25 19:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 97b637e188900cf659bb4a9c04716236 SHA-1: edaf37cbacfb2e37f167fbdff5ef0d7fca678f49 SHA-256: 817367f03f4704b1e48c3c575e0b8306849f754361ced6f13f8cc6d7a5e2b4be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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=business+correspondence+letter PDF link annotation
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c7e22bd293dcf5f7ba63581d08e25ccb/tofigopaxivajukut.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/8262709418.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3557508a---xuzotopogiwituxugipobe.pdfIn PDF document text
    • http://schokobrunnen.com/idata/37043298371.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/70032438581.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/nukafiruviwati.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/09c06b5e5b776f2014e7c6a6c277c15b/dosavulovi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098361195676---gizedofigapufiso.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227b33ca40---99729033215.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/19431310168.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ed216cb8---xurutop.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04d68618a---38939532136.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39fc34304---mozefujuladopegoz.pdfIn PDF document text
    • http://allasclub.com/campannas/file/74103516752.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c726f06ad22---jogozevena.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800449782ab---21451925133.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9ab72d380312a6c8ad31047335fc6ffb/76283900921.pdfIn PDF document text
    • http://dakmet.pl/upload/patineke.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/15582005470.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/pikovixuwavesokeviv.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd455d31b5---vikarivubidufune.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe5b769dc5---61880978938.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080828107098---71488899078.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076550bddb97---90094779131.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_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 18212 bytes
SHA-256: 3c7c96489bc95f127a7f2ce106eb0375e16d5b4c73de160ed8f13e4e2f91bd1d
font_01_sfnt_off00014479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 10496 bytes
SHA-256: 3118ab0ec0ebc148be0dc60534ab48ba3e1daf35b8c33da618ca74ed3d94149e
font_02_sfnt_off00015c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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