Malicious PDF — malware analysis report

Static analysis result for SHA-256 750256c46be42c0e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 06:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 774261233282ab687aa774bc7a24071a SHA-1: 958753591917d7825a2ca255a41aa21e6cdc6210 SHA-256: 750256c46be42c0e82c05ce24cdbd94962ac4b3d43c92fc3db823fc27381f2a1
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No specific family could be identified.

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://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47779450644.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/dasesedefanobazojupefo.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/pipivujuxuzasikakot.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913151354.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/palowibagiwimu.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/suzijadonerapijifiruvi.pdfIn PDF document text
    • https://hiroyoung.com/data/files/3219143833.pdfIn PDF document text
    • https://kham.vn/userfiles/file/2901389358.pdfIn PDF document text
    • http://at-studio.tw/app/webroot/userfiles/files/20210909_223254.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/63402892937.pdfIn PDF document text
    • http://budropol.de/Upload/file/75119236181.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/tedesofaruxut.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/zutoboluretipeno.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/navujoritiporupopojukosu.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/78160003977.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/16447fd409dcf4667039b8579263c5d7/gipixoj.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9573382b---bevozezilizod.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/samonuxodiw.pdfIn PDF document text
    • http://leeandrewdavison.com/download/53655535612.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/cc5ba48251cf6e7f373f2fedcccd8b5a/piduguli.pdfIn PDF document text
    • https://bem-sa.com/img/file/87443640691.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/27893627248.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/46534786614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=can+you+delete+pre+installed+android+appsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 10632 bytes
SHA-256: ffc0ce305f06dad09bd8e1a8a90b31ecb4aa6d208105d992138d4def0cc5d840
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 18360 bytes
SHA-256: 86f7e94cb965e394047c88ef2dff97f305a6043a420946ad086c791933491cf3