Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dfe320d25d5c72…

MALICIOUS

PDF

77.1 KB Created: 2021-06-19 02:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36e0d2be3753005e6f476e17ca8d90d6 SHA-1: 7490d31404e7b5c094f874059c4f6840e14bf8b4 SHA-256: b8dfe320d25d5c7221fd7a9234113da9af2c192ee1bb57836b1dd15d34318af7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=storia+della+riforma+protestante+pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/07bd0d55c80acf035ef99646c1631d08/46240312293.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/10a2b56f6f357cd895c6d880ec88f398/mojodugenabizabubivate.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa47d742c4---punodukesurimozi.pdf
    • http://mulroyenvironmental.ie/userfiles/file/sakipilarid.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8435fb5a---80079494014.pdf
    • http://boldogelet.hu/media/mimimavagowolesezaw.pdf
    • http://duszek-lasu.pl/userfiles/file/nunifuzefelop.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe5cc164f---58713038533.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/55aeaeafd387c23dcc49e1ef1b278c72/97927141797.pdf
    • http://beijingbeat.com/contents//files/59768848671.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f47c85a002dc630c2aa4b693c305f202/99687365295.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa448249c---rurebebefokirefefifugok.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/s44ujmo5tjfml9qh6ba1bbb6t2/8173078777.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/279a9d090cd19af242ae80c806ea2875/xitexixuvut.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086224319703---zolewusunomoko.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec85657992---18536065002.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf8.bin
c647550c4f9177d1d93011ad7e6e108b1a0e7ab4f345e90fa1e9fecf84978222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 5292 bytes
font_01_sfnt_off0000ffdc.bin
7d05178f1735e2895a4f637fc6c9dfff98cc87aaae53e219f393d3a51de45a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 11840 bytes

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