Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3a430281bb3d2c…

MALICIOUS

PDF

73.0 KB Created: 2021-08-27 23:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be5c6f86b54f896e95d55afa922c9b7c SHA-1: 649b114b96ca6a95f3e2b7a206219bac91794278 SHA-256: 7b3a430281bb3d2c21ba1130845930f6e38e3d5fb04b9c9819aef8028fbfb916
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many associated with SEO manipulation tactics, suggests the document is designed to lead victims to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://medvor.ru/uplcv?utm_term=madison+tower+mill+hotel+restaurant PDF link annotation
    • http://alphasigmaoverseas.com/userfiles/file/disajisulo.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/58906801842.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6479fddbdcae046dda469b800b525486/97520761412.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/be41fa536338048bd6f055b8342acfb3/70831120664.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5643fa2e41---89074148104.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da18d42bac---galurenetukidobus.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/sarerazejiduliwaf.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/zowixedebobenufit.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/9404941905.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/banumovet.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/2943593033.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49934785193.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/56d04d27ed7b061656860b447fc2d2f1/lekotefebovowefuwe.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/83826351499.pdfIn PDF document text
    • http://ruresept.ru/files/file/90955054625.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/12765217202.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/wiwomelarofijukelevalinux.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/64738779128.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/19214197770.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2451ca780---dejubi.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/tutozugepowi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5e1172c7---47194530652.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/gapafuvenulomukef.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9f8b913eb806eefa7e0641bcb79885a1/20174669570.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160964219ec616---1838694341.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_off0000be88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE88 15148 bytes
SHA-256: 839fd8298aebece64517cf73ab9483d5b790c29d3e4b1c01ec40138ecb574182
font_01_sfnt_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 10692 bytes
SHA-256: 42cb361f3d09f68486d803511579d381f372665795d3ac1711926983f9e4013d
font_02_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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