Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4be636936320a93…

MALICIOUS

PDF

147.5 KB Created: 2021-06-30 08:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b84d746b3321af7d547c0f1e2037b8c SHA-1: 00be1216383c06c9498f1525d5479af370c8463e SHA-256: b4be636936320a93067f85680e22ec21d42f1b0480c8ca02c346b7904b9ff70b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external URIs and is identified as a link farm, likely intended to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to external resources, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://pistant.ru/uplcv?utm_term=wow+classic+paladin+leveling+talent+build
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62376deef8---39323468410.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/53gvadk2crv8674vsl38ou8c37/14086713485.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/9b7f91693a0e9702bbca2cd0ac02d914/wogutesewaz.pdf
    • https://makanbanyak.net/contents//files/wulonatixaxabadofanam.pdf
    • https://drsaman.com/files/8450514459.pdf
    • http://curry-box-deluxe.de/userfiles/file/32910475039.pdf
    • https://beaszemin.com/files/modad.pdf
    • http://emeat.ru/var/files/fatofudutobolujur.pdf
    • http://studiospazioambiente.it/userfiles/files/jatulowisevakaj.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921dd15aece---31705684369.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8945af32---biwenelovafa.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a592278aeae---tenejese.pdf
    • http://yasairamenbar.com/uploads/files/40679442013.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/uvbela2dl2dsppq2euk9aif0n0/76889147538.pdf
    • http://omg.su/upload/File/wuponegijuz.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b00af0dcb---vidogijanimazuranodena.pdf
    • http://coffee33.ru/archive/file/fatuxatixiputudilu.pdf
    • https://rybczewice.pl/userfiles/file/wexukukikimazivepuk.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a92f70ef5---60391105100.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160af96ec5a940---porapine.pdf
    • https://alakharia.com/public_html/userfiles/file/bajesobeba.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607507321ef92---57694672356.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_off0001e668.bin
ad2795a9670a7d24ef98500edf4a870afc77d40d13bc2e8b2202908a503f337f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E668 10972 bytes
font_01_sfnt_off0001ffa3.bin
573076e95a7488c2e73b3bb319f5f4f0b9f33db08d53f1b3485a3cfc203c8390
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFA3 15900 bytes
font_02_sfnt_off00022868.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x22868 16792 bytes