Malicious PDF — malware analysis report

Static analysis result for SHA-256 c044e124d662e41b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 22:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc6fbc48aa39851beed509948d3f7d7f SHA-1: 0a9b65078c083c8bd970971581436ccacf7853f0 SHA-256: c044e124d662e41b3d9bcd969f9c09eea455601a96dee7fc5df9580dee5e1097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://automotiveenergy.cz/userfiles/file/vizetezamikadijunuz.pdf In PDF document text
    • https://elemental-ia.com/userfiles/file/65265766832.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/posokowafolu.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/57015076319.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/milixu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/93042654897.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/98784520195.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/74003917744.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301796d80d5---vukeguwonidobonido.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613084ff745c1---rekipubetebivivorafi.pdfIn PDF document text
    • http://signauction.net/userfiles/file/mevawew.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/rumelebigovub.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/wamikope.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/2187343824.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/14073124042.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/gorolupikaf.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/2342467506.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/42822758785.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/wajokabolijolamuvu.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/sunuj.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76732f18d---zafifakusetixazujajane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=god+talks+with+arjuna+free+pdfPDF 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_off0000d1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FE 11044 bytes
SHA-256: a9d002d8231257f2e53ac48b0636a03fe5bab91e5e1423f252ab582ae151af06
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 17976 bytes
SHA-256: 6cff08110769245088bcb3b7af0570584482f29e8ad123e2c9a34e28e3ef776c
font_02_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1