Malicious PDF — malware analysis report

Static analysis result for SHA-256 8168b39d9626cb01…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 01:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 90a1266adf7a64aea2c6cae4bc9b1b6c SHA-1: a945d3df66eb0e0bd4ca48799a87e9ccb244981d SHA-256: 8168b39d9626cb015a35dc525e192d12f4a2d8ac59ee3eea99bcb357a4d19c54
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on compromised websites or disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, providing a password to decrypt it, a common tactic to evade initial gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=comment+reduire+la+taille+du+fichier+pdf PDF link annotation
    • http://studio-orlandini.com/userfiles/files/jebediba.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/59552219041.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8367c57b8---39048739055.pdfIn PDF document text
    • http://sushibelovo.ru/files/40514351617.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cddfe7e23---bakujomunixekamixo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f5d21e8d8---71003284246.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jepexekafalonumamu.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/2949138279.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/98694337119.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/19125464559.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/povej.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/butumugesuni.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f59fff5bb8a---negaxumizupozabujuf.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7777e171e9---fedepebolalexinuxuzoxapat.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/diwamini.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/zupebiga.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/91187086043.pdfIn PDF document text
    • http://saaretravel.ee/images/file/ximemujamaso.pdfIn PDF document text
    • https://bfull.ru/uploads/files/48521937048.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/13304651699.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/rexepikebazugefadajipi.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/wavemubinavepenekur.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/71218739292.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 19868 bytes
SHA-256: 27100d0f805e9603fa3f967b07f8c608d67f49c7d9b628bac9299521cede05fb
font_01_sfnt_off000107f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 10848 bytes
SHA-256: c5f9de5066d647014985a41f2dafa430e1f9efb60bfb5f4f56938a64e5a6ee5b

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