Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea93efe95f70daa…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 01:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0489527819d0f2daf5e0e687c5467a40 SHA-1: eced5a06e28f021c4b9a23186ad632978a89005f SHA-256: 4ea93efe95f70daab2e8d9050fb43218c8320d1f501104400185076aecb67d16
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://eros-arena.de/eros/userfiles/file/3411303375.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/51493867333.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835c27c63e6---87350984880.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160718d8e63a46---28615536020.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722590a0cba---nuposobirusidiragunasef.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/cfjpmh3b4h5apf7q7p5g3b2cs0/13726619658.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ef16d4208779dd3c26465828bc89aaf6/94779302245.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608515735228b---79834461230.pdf
    • https://scalper.ir/data/files/file/jepowukenijujarugi.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b5bb0fff77f5f2ff557edc132eb53655/kezoziwokesanepazuw.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a671e31951b---dunobisezibepevivib.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/xaveselajukimonorazade.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/upi9o7cb8a912n8cii690irdir/76729250088.pdf
    • http://birnagarcollege.in/userfiles/file/vafeludebalovikom.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160766edd1668d---tesuluranuso.pdf
    • http://tokyoto.pl/UserFiles/file/95371704283.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d508f2b32---61320677898.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c5820f2a7---velejaxavefe.pdf
    • http://davidhammerstein.org/userfiles/file/tupafexapiwa.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ed8e8bf5b20a09fd31c34f06da15aa12/51322362700.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5f641594---20949370260.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f6f7ad2f---fifexolo.pdf
    • http://citra.cl/userfiles/file/lijuwofujerituxuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gold+sunstone+meaning
    • 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_off0000ff36.bin
37780e755bae71a767a91bdbcf44f678ca03b399726f38720c1aaed9150a8138
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 10628 bytes
font_01_sfnt_off0001174a.bin
3e1633a859dcd36316cb25d0d3b04ec332db615b0cfcb38cda886cbae7134759
pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 17876 bytes
font_02_sfnt_off000146b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146B4 16792 bytes