Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcd042c1cc63bc4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 06:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 391c69099bdd72d0547c06b7d7fb764f SHA-1: 23e7879c2d8481a8ba232248a8d4ea92d3c902c8 SHA-256: 1bcd042c1cc63bc4b812d8f60212b8a8e9f6e62095971ae159e9a850ded9f9e8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress sites. The document body is unreadable, but the heuristics indicate a lure mechanism, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://autoscuolavalerio.it/userfiles/files/ririgowowaweluwabumed.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/q8qgigb6ejmbm48m9qf943k001/94306592982.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161373f642e248---vefujixuvotabup.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/vulitu.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/67860517086.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe76987697---36905358211.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c21e39a2---refetozodesudetukuvoritep.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304c62bac92---52375055185.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16147cf7cec143---xurijiwatovesuriwusa.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/xunaragapuzus.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3fc37efa---dimarex.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/97090580059.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/45627167623.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/kujosolivuditexugulotil.pdfIn PDF document text
    • http://c-six.it/userfiles/files/xumobovafonojimavegitedex.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/49494307210.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/57377749252.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d433a6f561---dilagumekaporavodotusejun.pdfIn PDF document text
    • http://17njl.com/userfiles/files/36154464656.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/94639968787.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134af8eda12f---kugaribazetuzugagus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=x+ray+scanner+free+download+for+androidPDF link annotation
    • 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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 10580 bytes
SHA-256: 7b966c6eb4fb4f53bff75374aa7472a1a05c26e7d051b251641995193d4fbc31
font_02_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 18424 bytes
SHA-256: 452772d1bc13ddba791a237a2dfa6ed114ef490f551a8cd2f0a124342b0f1552

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