Malicious PDF — malware analysis report

Static analysis result for SHA-256 799f98366eafd3ff…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 07:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b10e2c5bb508620ef0ba5f4f7e5347b9 SHA-1: 432cdb8d9cbaa6902aec21f89fc2a83abec4091e SHA-256: 799f98366eafd3ff5b3a0b06eeba8c7d33840dd05b5b7800e82b331bfb2fbff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a campaign to distribute further malicious content. The document body is unreadable, but the heuristics indicate a focus on linking to other PDF files hosted on potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609494af1c364---81852674388.pdf In PDF document text
    • http://aire-limpio.com/img/editor/file/42238903095.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/tipase.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d885f9081ab---46484126303.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/somexanugexajedidunom.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/20689345297.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529085121.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a6c99231---vulurozixajus.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/83494126689.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782fa2c4779---68428963523.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/p3n9r5uk3muv1am17bd9ova62k/gemeriwetegit.pdfIn PDF document text
    • https://x-software.cz/data/file/25460462804.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/53336373591.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/74339552462.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tizowasebesuwodipubuzasip.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad92ab1561---30234629361.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/rugunax.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/wuvixirolasofanolu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160829fa1c19d3---57797265874.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/55915329827.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/93103146521.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/jaruwak.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/bc9d595387554bb2df15b5769ba49315/57563654308.pdfIn PDF document text
    • https://nasikampung.info/contents//files/79525282866.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9d3bfb2c---minevedemupurovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mitsubishi+outlander+2005+workshop+manualPDF 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_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 11444 bytes
SHA-256: 0ce0dde7aaef955b47d4c473be471df811099023541e53589e3df1a0a3efb7d1
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 17420 bytes
SHA-256: e8c0d9397e490d641361de2a6438d606b9ebd5f4d2a57eba83c85843f90618a4

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