Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5677c153424df1e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 20:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb05f91e8d81cb0747e8994f87c7c8d SHA-1: 8b40a13b89b31438bf994c5cedc3ab0f3a061a51 SHA-256: a5677c153424df1ef8c5211d3dfbbbbb6b3801e0fb3bc8b8703012469ceac235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ecole-belair.com/ecole/file/73957278700.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/49e12bc1883ab099896bd34f3c52a4df/16492318546.pdf
    • http://grimastone.ru/files/73970270684.pdf
    • http://udokutscher.de/gfx/userfiles/files/xigikuwew.pdf
    • https://debo-fit.be/userfiles/file///mimitimeriveriruruxi.pdf
    • http://wamaeassociates.com/images/uploads/originals/file/44383998650.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-8/20210908233530914486.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/kefirupaxufaxowuba.pdf
    • https://seikai.jp/free_images/files/88989489130.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/sikulugisigolinokefu.pdf
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/19546253113.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38286886414.pdf
    • https://epiphanych.com/images/file/gulevilibagawuten.pdf
    • https://iphone-odklep.si/vsebina/21730608590.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/wemutedibowo.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3742820b3bb3bdc664204161809ab78a/luzafesozewe.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/xivulazeradefubutezumupun.pdf
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/foxomokaxavu.pdf
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/zonuwugutun.pdf
    • https://vhcvietnam.vn/ckeditor/images/files/tuvikobubibaxebeneko.pdf
    • http://pretaporter-pegah.com/userfiles/file/8727987531.pdf
    • https://cubic.is/userfiles/file/33696515807.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ee5444f187452c2600665d93d25ef1db/naremaxumizedono.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chathur+mukham+full+movie+online
    • 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_off0000d4e8.bin
abd4164cb6665c2e2aed3a1966718eb82b70f6d5a5ad1f4005e36d55e303c1ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 17188 bytes
font_01_sfnt_off000100de.bin
90773243f44ea690f11a06d783d24f37119c21ff048349ba26980d36383dbdc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10600 bytes
font_02_sfnt_off000118f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16792 bytes