Malicious PDF — malware analysis report

Static analysis result for SHA-256 18935c7713eca2fa…

MALICIOUS

PDF

95.9 KB Created: 2021-07-27 23:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 566cf734b03622705b01a97f9a73507b SHA-1: 509a049c113f83429d4569f5d690522d16848d8f SHA-256: 18935c7713eca2fa7cbd73c23616d6be1860622125a84761c5132b18fe9723a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/02de6e362808051ec8ad7b14f03e94f5/70527618002.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de0d2e56f90---fugukimafudilem.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/panuwidebujo.pdfIn PDF document text
    • http://sooclose.eu/upload/File/75450633529.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/79cdc53e05b44e376ee88aa37a47985e/sosaribabuvamotamiwavigo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607618fcc0a53---simomow.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/tofoxukife.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/kurapeburox.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/750b72fb48cc60298dc27a660eb7ffa3/kajaxitabonewe.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7db2105da26110911309b0236c1a8018/kexaxeborusitusigu.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/18322287829.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/fojabajoxatemufuru.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/58935660408.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0b2a8560---99701456554.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/74777742146.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf1222fa51---19580525752.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a12355f52---vafine.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/n0h1gda5og8juqob5q94fq94e0/vezoretemigod.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf73571ef0---8558767551.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c19489194b8---tunizexefaviled.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/96906060257.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/92386347351.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd0ee19b85---54665560484.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/eskn67mdr9ke0t4ruo5gu38j52/18176690520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=city+of+thieves+moviePDF 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_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 10276 bytes
SHA-256: 15e53f4c454797304239808caf18b8ca02facab8bd3e674bcc88d1db6825590f
font_01_sfnt_off00012a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 17828 bytes
SHA-256: 6dd1cf27ba4a5c0d23d00580c7d228dd23d5f06ce3683f31f34b90ba1cd72e48
font_02_sfnt_off0001595b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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