Malicious PDF — malware analysis report

Static analysis result for SHA-256 05acc6a1d0543a17…

MALICIOUS

PDF

70.3 KB Created: 2021-09-03 23:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04a66a47012fc53dbfaaed731eb28ba2 SHA-1: 5c75b63ad7daa1d64585219751c342d24aa510e4 SHA-256: 05acc6a1d0543a178fb3295bb436bc690f4f95a26faaef2f2b51d2b9fe4d14e5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. This suggests the document is intended to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=1000+difficult+words+with+meanings+pdf PDF link annotation
    • http://yucehukuk.com/resimler/files/30845387420.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/webubetowozufekit.pdfIn PDF document text
    • http://abc-tel.ru/data/File/namurilozefelun.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/29579980674.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7970083699.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hcquaf1ftaiva9il1mq0nklmc5/mapubomokomezegamik.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/41479043835.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/17191328213.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/99739056087.pdfIn PDF document text
    • https://menu2uplus.com/images/file/5426942568.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/8116594426.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608b89777f076---7604350905.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5948eb7b4e---13423017724.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/nejodurone.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/0c0baa0da20a9c036516b5dc0366d8fe/rixos.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_off0000ae8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8C 16860 bytes
SHA-256: e91c0eda667f1956ad8e9fc983f445702a99c009f7ce906ac44b2a6eb1c135eb
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 11332 bytes
SHA-256: 396a46c58cff4bea554ba06120383bf32dfbcfcca4245a9f30e3c47baf4ebd35
font_02_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.