Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db1acbee3c78f24…

MALICIOUS

PDF

91.2 KB Created: 2021-09-16 12:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f0f1a16f74fc2afb312455565ef38e5 SHA-1: 3854d744a73fb488f64ba37a15c4190141cafd7d SHA-256: 6db1acbee3c78f24acfadf42744073a13ed20ec8b7476240cf9b08ef234605a7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content. The presence of embedded URLs and the 'SE_QR_LURE' heuristic indicate that the document likely directs users to external malicious sites, potentially for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://greenflameenergy.com/userfiles/file/7874353774.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27d4e2270---23051339215.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/99694123387.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/31899305048.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/sikexujivo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/e889pcbdss40d66376j0et8t95/zedekov.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/rekajubaze.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/28129149793.pdfIn PDF document text
    • https://magerp.org/upload/files/zugajezakanapemozijip.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/wowak.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/lijanutotejewogidem.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/pipomavive.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/77130556223.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95f37b834---befodumuvusepomagadalem.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/zitibamutosutunakegodib.pdfIn PDF document text
    • https://vendax.ro/files/file/98248395841.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/tufivevodilokisavel.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2fe6a7a84---moxosa.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/86505192680.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/wabipor.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210912_2BBD190171250AC2.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/30553506578.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/52002569732.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/zebobopoxipiwewe.pdfIn PDF document text
    • https://activepymes.com/pub/file/11618334131.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/gafabinagoninel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=macos+qr+code+readerPDF 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_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 10160 bytes
SHA-256: 6e5a9018fa95a9fd9e499756d4bc7d5b7646f08af079a55bd07857e6cf01d226
font_02_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 19572 bytes
SHA-256: 352abec11d8b55027d4d64a6abca63d6be294bf9d684853e92dd262ba6d74472

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