Malicious PDF — malware analysis report

Static analysis result for SHA-256 7079147a87cbed72…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 05:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96b59efaa0f8fdfbfe707442c27d0a36 SHA-1: 2534dc22ff09370f0845dbd1d688a4e8636a6ba5 SHA-256: 7079147a87cbed7254dafb8f708e818379dc213f44bc09851cbbcd2de1667b1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while numerous, do not contain exploitable content themselves but serve as the primary mechanism for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/f636d99775f1f4bd0892180945a4bc71/15917109063.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f0306cec0---lobexumuv.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/rufidokoru.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/kovumejumuse.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/butofezukalidovug.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85ce0bdf0---dujoxowetewamadiju.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096094b779be---duwimem.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/tidit.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070108f43200---vodola.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/vakiza.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/rilizegofagapowitabodij.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775940c13c1---lululesewurufe.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e0bdebd71226d560a86e768e0987171c/5778453576.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c42298ceccd---64547100905.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/26709eeb53a7c36108d4afde3b1f99d2/lutate.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/f8d6bb65177cb18370442483f41e0f05/13318791230.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/wivopejovuwite.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/c9a88putsbkvvronegqnhs038f/pidade.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/10259925687.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/67174583923.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/83300934132.pdfIn PDF document text
    • https://noventa.cz/media/files/file/20466056546.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/wufikixegatoten.pdfIn PDF document text
    • http://cycling-software.com/files/file/wawozuvujege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vertebras+toracicas+tipicas+y+atipicasPDF 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_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 10440 bytes
SHA-256: 531251f4259b40bef7de79599702778e714076a87f54e7a813264b245f098732
font_01_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 19084 bytes
SHA-256: f16ec5bb5950a43bdb09ee43abdd4dcf95a937359cea71dd952e458f431f08f4

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