Malicious PDF — malware analysis report

Static analysis result for SHA-256 8739e6876ca03090…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 00:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 39415f1fb2a87713a8b4a2b52807a831 SHA-1: 4f6dabbe8ed756aee0534b12d2ddb1d82b97853d SHA-256: 8739e6876ca03090857531b0adbdf7905e6751eb818d8c20f9d813d6468493d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/15sbr1hv6pkp6ns1orqkrlmjd0/komitalizada.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4f89a4a165ec1402a26eafe272969412/teforewozijinijog.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/3290637958.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3b6cf029e5eeb76d38db432c4370bca6/mukamalarazo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a5ccd65cd---52791583015.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5c13135374---jitugikadubo.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/soxadalevozizojotego.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lltme3sngc9lvh8eac0cgtpvm5/rasawazazomujajomej.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/89307563990.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/77893797789.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8dab316d---13222609533.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/33414125539.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/muxepomujexilowazeverup.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/37743814208.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/pijakakubigojaduzi.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ac3107d76323fb6e57518260742639f6/66522257252.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a5aefd48---88512423758.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/45515150100.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/fea52b92b748268a17e9472a074095bb/roledeguxuvomokagetenura.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wuzatebap.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/69829526441.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/28192115160.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/10238872366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=benefits+of+drinking+100+oz+of+water+dailyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 11108 bytes
SHA-256: 9f8adb044261e1823508f7252b6fe19aa91b137620689ae2a662fbcb698a2569
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 17120 bytes
SHA-256: 4fa0799de7f6782dcf283748e4b27d20cc752e0bf1a97a53d78fdfac3006154a
font_02_sfnt_off00013231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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