Malicious PDF — malware analysis report

Static analysis result for SHA-256 604f6bc4900ac137…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 07:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a6cfd09f75cb12154b3c7952f6df4b8 SHA-1: 64124fdb911992a3c06dd8621cc348b7ea5fb098 SHA-256: 604f6bc4900ac13714843337d5bc4e181b46d0180765fc52894fb32f205825e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumolaka.pdf
    • https://vanphongphampmc.com/upload/files/finokolevozozuzaxu.pdf
    • http://clarksville.net/wysiwygfiles/file/zixijavuxosesomaw.pdf
    • http://chiari-web.com/ckfinder/optimist/files/lefopijotamizetosidisesus.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/xipudasetalipoxa.pdf
    • https://klcconsulting.eu/klc/file/7821586811.pdf
    • http://net-marketing.hu/images/files/vigemodafolilipupuvir.pdf
    • http://thibangoto.com/app/webroot/uploads/files/gesigujowogolebewuvawij.pdf
    • http://belean.pl/userfiles/file/vupow.pdf
    • http://www.moyekolodin.com/files/87728683374.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/zakagurofezux.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161382efca392b---kuvugagagoxezugisififik.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50527aac1---kakofuja.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610c7c2870---11280764558.pdf
    • http://konferencii.org/web/uploads/assets/file/59634415949.pdf
    • http://kleinschadenexpert.com/userfiles/file/razanelokixusixoruxigiwir.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/77581703927.pdf
    • http://bjyhyy.cn/filespath/files/20210913161948.pdf
    • http://phutunggiahungoto.com/uploads/files/66431395520.pdf
    • http://monarchiaerembolt.hu/tmp/jozepof.pdf
    • http://garage-ys.info/js/upload/files/tugebom.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/doraxikofijifopoveb.pdf
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/vebikuzobinule.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ppsspp+game+tekken+7
    • 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_off0000d941.bin
1352fac354f904c927fb61819a0ebb952010284783a192482877654f1646db81
pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 10380 bytes
font_01_sfnt_off0000f0da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16792 bytes
font_02_sfnt_off000108ec.bin
d181805586086a311078c27aad3f5fcc238c1845aa2734c64946ba588599a746
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 17260 bytes