Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b081ecfc40667d…

MALICIOUS

PDF

91.1 KB Created: 2021-07-21 10:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b96b3671cb744d390b3f68203d58c65 SHA-1: 1c0b4e19755dc2c65b0462770f52af8243cb8941 SHA-256: d7b081ecfc40667ddfe1e6eaa8849682c276cf3a7e9fb8d10b102854c2411d15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ugrctrani.it/userfiles/files/52807814856.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af5ea89022---85147951807.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e2d88805c---20831563419.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/wusixetimaf.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83446b8cb---xuwatisigaxujetopinap.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/zotutasuwusadibaripavak.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2eaa36a9423ce3423bae1367da36e4fd/ziwozibevaxuxudetemuxudix.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/36441769625.pdfIn PDF document text
    • https://digireg.lu/upload/rulawexazudobepoxebe.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b348b39e291---jamegitegafepolu.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/79559459108.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/33382255972.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/bumineketaxa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf4f42795---kulikixejiwowu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/90221599565.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/pukozidodesew.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/76488857261.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f781ea054a4---26944896397.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c79b802c0---73925121698.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e62fe3805---82357036866.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/defisojijedinojefed.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/55898545467.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/55150022099.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/buxawilu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ac573468---sajutefulabekaxodube.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/2295933344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cashew+alfredo+sauce+without+nutritional+yeastPDF 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_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 10904 bytes
SHA-256: 8f873749533af609fec4c3868ec5eda39b64180e836b644c2301038fad8f9674
font_01_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 18020 bytes
SHA-256: 32901d0b59e531e3fa33d204c795ae57ceaeef2dc1ef84c7fd3e956a9be95c4d

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