Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a3f353472f01dc…

MALICIOUS

PDF

73.9 KB Created: 2021-07-17 09:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58b94d6f79207171b7bab87ef8213599 SHA-1: 40a8db64051e58e08b05d93c478c7af9929dfdaa SHA-256: e2a3f353472f01dcd87b0eea7492602a6c580fa60dc981b91d704d04d3396fa2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URL analysis confirm a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607119681a18e---fowekufotufegobolove.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/26b967d9a293d72ac0857c30048d0b2a/61921485582.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/guvipebawo.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb0be969e6---3637158916.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16084a91c6f5d1---kemozirod.pdf
    • https://bacninhonline.com/webroot/img/files/13826491946.pdf
    • http://lindseyderence.com/userfiles/files/mupafegejirulefiwu.pdf
    • https://larrialdiak.es/files/galeria/files/71005269705.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b4hrve8u372obc4nhbhd6lbcj8/tamafo.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c590fc43aab---66151903866.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/cc70883b0e38f0923976e5ca6225cf8d/65822497136.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c0e504d78feda5544957519e22ca218b/rawugafilepezevizefuz.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/37963409028.pdf
    • https://taevlingar.se/images/pages/file/23383726541.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49d9cd09e---ganov.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975b48604e0---xipapif.pdf
    • http://kwong-cheong.com/userfiles/mobukiforafeto.pdf
    • http://poiskvod.ru/images/file/wowepufelivikutamuxa.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/nukodofizibuwigisu.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/fd7pqd39moreihs4eng2q5b003/bizezibatodudevi.pdf
    • http://pcccphucvinh.com/upload/files/50142748300.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/46807152449.pdf
    • https://xlspandoek.nl/userfiles/file/jiwowikibemet.pdf
    • https://ctsgroups.asia/images/file/5486519396.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wiley+interpretation+and+application+of+ifrs+standards+2020+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb5c.bin
dee1f29b95b785d9d946a012c30f476fdf613e52636169d447a5523f2b91c2ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5C 10960 bytes
font_01_sfnt_off0000d4f8.bin
741ba81647677c3036a9eccfa196ab6c80565e3b42beed4afa6f1f4093098cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 17036 bytes
font_02_sfnt_off0000ff9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 16792 bytes