Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3ff0258428986e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 13:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 646a44f7d793e41b15ebdf17e683bd2c SHA-1: a3a0c0536e16b018f23fea06b0f2e66992f0ac5f SHA-256: 7a3ff0258428986efbf73d9549be5f93ca96c8b1b27a91a0a85f733bde1c6bbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, disguised as an Android system update download. This suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.abandassociates.com/ckfinder/userfiles/files/buluvipidenorikeku.pdf In PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/tokajamewe.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a8347df4b3af84d14da00aa3c1075882/84299087808.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210903_573A10976455EE47.pdfIn PDF document text
    • http://ty-int.com/files/files/70970504665.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/57811379450.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/85383749386.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b71db2a7d00192a1bbcf149b835e33cf/14195708266.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_184804.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/77969663956.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/47074399206.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/xuwewuvibexugumukubiso.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b6ced527---jowejabixibogig.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/lotodonafasuxamodifeneg.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/64744311019.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/47618531806.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/peluvexalepiv.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b223ca1a5728ab4089d237f138acdd98/ladonifadox.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/64267452147.pdfIn PDF document text
    • https://phukienbep.net/media/files/27451622124.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/puniguzezip.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/lakediwo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iq3hvbfitsbekf6e3smurq87o1/kowagovezepozelimivup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+system+update+downloadPDF 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_off0000b995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 10836 bytes
SHA-256: 583565fa1cf699a61caf6280caca109c259c03fb197f3d7f79d3f49a083178a6
font_02_sfnt_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 16140 bytes
SHA-256: c1935680c523fcca42ce177f1858a24a910cccb07e0f0e576583afee5780306d

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