Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf08eb03e4379c5…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 20:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f527c19f9f9cc14bc442b10ce88ebcd8 SHA-1: 32d933fa72da16c242a8b814166f41e2fe9271e1 SHA-256: 9bf08eb03e4379c53ccb80c35eb1c9bab560989842ef4b4c12566eb03ce933fb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious file downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a pattern of using disposable hosting for these links, likely to evade detection and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://pistant.ru/uplcv?utm_term=multiple+html+to+pdf PDF link annotation
    • https://aimhc.com/userfiles/file/63593603890.pdfIn PDF document text
    • https://oversaslogistica.it/file/21464043343.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/44402095842.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210625_122968DAAE7DDE9F.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946b44e34e---17767813052.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7da1d6c853c94f5ad58857a5e73d55a5/1554448797.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a015f578209---jafuvavuzikisaw.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f377c27ce7---xofut.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0e5cda09c---nebavimerezenok.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608db1d3be2a5---nerewonofe.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/03o51p14tp495s6ab3ekinne43/tupatigixoguj.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/10771161305.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gelipejasiv.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/s5bc2gi6p3tjj97fp2can83cbu/zikiroxad.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd8476535---45823132511.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/1039327ebc5134ce17c0fbb3932f2569/67985562301.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/be1806fa7c141517df6399d5893f6284/tirafinipisekotogirak.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080600bf377d---dudusom.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/46831118931.pdfIn PDF document text
    • http://esistore.de/userfiles/file/16978619032.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/28c6ef43cc690c48c61dfa3908e0dc8b/46901213968.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c1cbb50c21aeec1c45f5e00652613472/64760141671.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 16076 bytes
SHA-256: 9dc74535a6692f4260f0355970fcc7bc2a5c5af40b851cc3ce6f07945a46146e
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 10324 bytes
SHA-256: 60471fea7a620ee042547f74a957bfc9d01b99a3ac0fe4326b0e4d3e932def60
font_03_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 18780 bytes
SHA-256: 6e925d0a4a09c94a790f354768de5268771f40322ba003fda94f11062b770248

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