Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe51c9a068d304a4…

MALICIOUS

PDF

67.5 KB Created: 2021-09-27 14:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b0f9f3732a73e4e8b3b1e93d55b9061 SHA-1: d86fe062689917b6b370e0feaf668641591ccb04 SHA-256: fe51c9a068d304a4dbb9d79e1e1e1de17d35453deaefa0bddd11f058bcb8c94e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it's an image-based document designed to trick users into clicking an action trigger, likely to download a payload or visit a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=once+upon+a+time+season+7+torrent PDF link annotation
    • http://specimport.by/files/files/tefigigi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613caebb9863a---fomidegud.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/45835284504.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259e718fb5---xofirawazogovifaxobujavi.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/duzekimokogobirepop.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/pufunakofazititopew.pdfIn PDF document text
    • http://carbonelite.ru/file/71389223109.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/rujafuwudowokesopufo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fcb841a61.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/pifinaz.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/92597255755.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476965d659b---fanoxiduriwas.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/98407371369.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/38595079754.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/64404384164.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/66529496012.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/butaxiwotodinovupib.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/37915609666.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/supek.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/65532621900.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/21926639207.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/fusojeburev.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_off0000abba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBA 10664 bytes
SHA-256: ba3f504ff9c071247137254ee24881b2dbf529a24a9e058d784ec09c6bfbacb2
font_01_sfnt_off0000c443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC443 13832 bytes
SHA-256: 2123f848abcb4bf1d6d460d458056c448fa1f0bac971f2eeeb9fef6be2c905b6
font_02_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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