Malicious PDF — malware analysis report

Static analysis result for SHA-256 597897742e4444d9…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 14:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 852a15ce9a74ea57a19da664c66d7bd5 SHA-1: 386098d257447ed95446996c6f88459ba22b0d7f SHA-256: 597897742e4444d9ef432552ffe790fd91a83642e7a05676b19fca3afe5fbaf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to various compromised websites and disposable hosting, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://yapluka-services.fr/userfiles/file/dobevikikeluseno.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141626db2a2e---fidofewenozafominipetezaf.pdf
    • http://rencontres-icare.org/userfiles/file/69584672034.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/767eda28071a1f766a8b397cd829488c/46826918977.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/63071106728.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a3104050---95064156840.pdf
    • http://king-tableware.com/uploads/files/202109081229125072.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143698e18ea4---7585881247.pdf
    • http://dvif.fr/userfiles/file/xumiputufoxaxoburifiwoxaz.pdf
    • http://18554080.com/userfiles/file/19188696397.pdf
    • http://alles-vom-schreiner.de/userfiles/file/48798197715.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/55881773727.pdf
    • https://slezanie.eu/userfiles/file/josozat.pdf
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/kutisasazub.pdf
    • http://asu78.ru/userfiles/file/16795684528.pdf
    • http://zeci.nl/im/image/wotasuzilefezam.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/74498055509.pdf
    • https://tarzminder.com/resimler/files/81458014141.pdf
    • http://zsmnowakowski.pl/userfiles/file/gubumoxakenem.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eff1bd447---41902650404.pdf
    • https://living-stone.lu/userfiles/files/dufolexa.pdf
    • http://delfosventures.eu/userfiles/files/52276825245.pdf
    • https://piphoto.tw/uploads/files/202109061146573205.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+files+from+my+laptop+to+my+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f120.bin
6abde3d9ea91c32a4d5803b6e3b61052828a1e974f88d1b00df9b0d8d5f35fb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 10952 bytes
font_01_sfnt_off00010a57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 16792 bytes
font_02_sfnt_off00012269.bin
4c01ece3d1330accb46bda509c2b3610567eee80bb6ffaa54e9c69dd69855193
pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 17292 bytes