Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb1663ac185c7eb…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 11:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d40de5a637b3d510a1fe048ce67d45c9 SHA-1: 0992e18d02dcd36bd5d15fcde31e840826ba34c3 SHA-256: 0bb1663ac185c7eba277d57733f74e09cef00c0e8fe50188d46530c4ca15f380
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=metabolic+acidosis+clinical+manifestations PDF link annotation
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e7so2s06gp4ppcbtou19ijeo6h/92175365595.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/derij.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69ef5d20b0---3919377387.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/matijaroseb.pdfIn PDF document text
    • http://technocom.pl/editor/file/39653139272.pdfIn PDF document text
    • https://tavio.ru/files/file/56788273845.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/72242804756.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1559b7be---fosugipirupomero.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968bb79800b---75260007347.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dac0d70f377---21484054692.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/zowuraxefo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/47e48bef3c838e2f1ac3ba39f125a8e3/kawubatajokowowibuvup.pdfIn PDF document text
    • http://unsersohn.ch/images/file/91996099439.pdfIn PDF document text
    • https://raljob.com/userfiles/file/34835334957.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/pblevel1hqi4qkqda07oadvf66/62407259042.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/42251557059.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/pevosiwaf.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/jofatigoxidare.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/68089825589.pdfIn PDF document text
    • http://traviet36.com/upload/files/248827500.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a19824a9891---41699867693.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kivege.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/tarogurorejelizivilagun.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_off0000bb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB90 10672 bytes
SHA-256: ac31045f405bf342c4191030f741364d2b577dff2ed5ea856c6bcdd6a9d700d6
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 16284 bytes
SHA-256: 06346fe2f170260b3980a59a0ff2b06ae11b3c71771b02fc2eb982648896b286
font_02_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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