Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea59e6d80cdaf3cb…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 16:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d15b3fd254b18ea6b879dd7331d2435a SHA-1: 0ac82fbbf98082dab7356909f0934753ca5183c7 SHA-256: ea59e6d80cdaf3cba02bc485bec7c3fed4189c9ee24bad58859fe971483851b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://bloc-immo.com/images/luwelagejadiwuwaxuwo.pdf
    • http://barcelonasixtytwo.com/userfiles/file/waxurobejipapexifekowo.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de734d137---bigititojugetujegagot.pdf
    • http://olgapolyakova.com/files/files/fizepeberafomozuxono.pdf
    • http://asbu.net/uploads/FCK_files/file/jizovisize.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16d27616b---31661806144.pdf
    • http://yao-cheng.com/uploadfiles/20210620143447.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23dd170f74---vovosodefiketomukegep.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bddf9e76729---bebowolosubazo.pdf
    • http://magnachip.cn/userfiles/file/20210511180630.pdf
    • https://biothiennam.com/media/ftp/file/20418093909.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/154fef29537301aef891ce22a41ba9e5/838966538.pdf
    • https://theatresaucinema.fr/uploads/file/texati.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bce35119c1e87c5697d35b9ff1d63bcc/88901607878.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebff830f2---15586869016.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b248bb413c---19032341850.pdf
    • https://tocken.se/anvandarbilder/258/files/jozarusafowewukizezime.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ed2b36b4---riboxababobotevetika.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084396185896---bofipedusokuki.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/026060522ffc24cb6755cd1d78849070/lovolufepedogupuvatiwewur.pdf
    • http://mistral-paints.cz/userfiles/files/wurugunipigulo.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/45405046104.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/89sebv9ehoemdq6ff5esj83b45/93077801973.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=need+for+achievement+theory
    • 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_off0000eaf1.bin
21fc60195c3d7d53be3483b312dd7b8c2ce1dfa0334db01a6484c42ef02980a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 10684 bytes
font_01_sfnt_off0001034e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 16792 bytes
font_02_sfnt_off00011b60.bin
d485870bde604f7e8e499340378d6ab8f683d375444574fb2c3c22a613e1a620
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 16428 bytes