Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91ba6f1fcb4db64…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 01:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a77d0eaca6261637c5a467001d5f166 SHA-1: dafcc1fa4d43b319f9a27251137b36769ba39faa SHA-256: d91ba6f1fcb4db64179c55dd081b1fee2f899b2ef3689f02f88610cbd2ef0452
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm hosted on compromised WordPress sites, with multiple distinct hosts and a high number of links, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution attempt, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/salv68qpa34sua1kcf1pmv8c92/xasizibijuwunowaf.pdf In PDF document text
    • https://fishboat.hr/files/3150736538.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5307319a93e1a036f8c273ac89465101/79758877421.pdfIn PDF document text
    • https://shinaltd.ru/images/file/nezuxinotufur.pdfIn PDF document text
    • https://kartplast.com/resimler/files/75016592925.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160949e340a979---43937685657.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/megovanutekozer.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/danobegofes.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c896c6d26be---nanezebozaxopujebajen.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/37139660621.pdfIn PDF document text
    • https://superchills.com/userfiles/file/niwiberor.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160acce341133d---vigaxiwodoxofofujat.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/20370918436.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/83530427187.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d4ac08d1---rafezeveriditibi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7866a97d9---28191612976.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/83764800876.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c19b6779---86126958595.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jikativoxijowirixed.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/fiwawakawaduputodepa.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/78271730394.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/10777144766.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062710480273499.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/1845740762.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c272b749a7---moginageko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tuck+front+lever+pull+upsPDF link annotation
    • 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_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 16908 bytes
SHA-256: 6892e37c8112e8a700787bcc910579e375a02db3a254a4b4e5fba2615023a54a
font_02_sfnt_off00011fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 10440 bytes
SHA-256: 67597a094ec1aae345463237c64e89999b665423f94a6cfd93a6caadb7217b70

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