Malicious PDF — malware analysis report

Static analysis result for SHA-256 074cdcb4f1683eca…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 15:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74c1e3593c29b140811b98ece408dda1 SHA-1: a3d947ae97e949fed9df583f468ab3073d573f78 SHA-256: 074cdcb4f1683ecacb4586692db01b099bc86af7ad63fa4ab5c6ff9a690073ea
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF's structure and embedded links indicate an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laborke.ru/uplcv?utm_term=philips+gc518+manual PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f54f0ab3cb1---sijixozixebivikimolipe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1e1cfd34cadc228465435af8ffb829ba/7513558745.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/65183917115.pdfIn PDF document text
    • http://freeski.hu/freeski/file/zowoguralaj.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/36494638113.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/gizanovomolonugafetoso.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/75cf5137b5a8eb620363a42a650a31f9/44284824072.pdfIn PDF document text
    • http://beiks.info/public/file/dolov.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/88029773690.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/zaragoziwewuba.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/21664557220.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/bupavilogijozurarubit.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d219f502d8---45921540121.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e527fcb517b---kurumejenotujaja.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c05b11492d9bafcc7d136803e62929a6/tolinujagajisulerukena.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/rizolakapijumekubekezo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608d759eee6d0---82158455864.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098419948b8d---58299599787.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2541abe97b5f6a3bfec155647414f4dd/wedasuposodikej.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609baba242106---51493243103.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/47501265280.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/wumaferodutedap.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_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 18384 bytes
SHA-256: 12671966659f08b47ed3aeb3a6e0b140352773633a0a4a96a9ef86251ed2d285
font_02_sfnt_off00012f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 10864 bytes
SHA-256: ad9ae2ee522abf40382e992fa82455be7b393e4cbba6c18752e4d335996bb784

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