Malicious PDF — malware analysis report

Static analysis result for SHA-256 915a53120f068f0c…

MALICIOUS

PDF

80.1 KB Created: 2021-10-08 08:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3c74c68e6581081a9d406e06cdabb506 SHA-1: 26d6dc097193efc2c2c90ac3e3911c5c76819ed2 SHA-256: 915a53120f068f0c0caac769d7095644038e998d63bf098a729345fa18815b31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=three+types+of+distractions+while+driving PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ecbd2637d---temuki.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/tugokalaz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161460e9d7574e---36103784631.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8ddf0d12---xoxetupotigine.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/37621654098.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/98150756162.pdfIn PDF document text
    • http://flyingfish-stay.godyouoh.com/userfiles/file/60824377176.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/7940002512.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bac56fcba---lotatekixerenizu.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/42606163597.pdfIn PDF document text
    • https://micsys.in/userfiles/file/foxamaxifalurozizolikopo.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/62043417188.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/welafidokixajilexubutojen.pdfIn PDF document text
    • https://aayams.com/userfiles/file/mipufise.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/5251471922.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615c9db96a4b8---77078031217.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/xuwivimutulasezusa.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/42635192923.pdfIn PDF document text
    • http://186086.com/upload/files/tozera.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/felarit.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/wusumuzanekeva.pdfIn PDF document text
    • https://forumsevens.com/images/file/kuzes.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/lozurogudoniguteki.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/biwiguvatimajamomige.pdfIn PDF document text
    • 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_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 11128 bytes
SHA-256: f23b80b0cf1ac5849d7ee2478aeb5a4982d148ae263a380fc6263aa28f0615f8
font_01_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 18600 bytes
SHA-256: c2c11b2da5907f1763a0adc1600d01a225f3917521851edda48c0a4deb3a4c24
font_02_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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