Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cde027c3ddea98…

MALICIOUS

PDF

78.2 KB Created: 2021-08-27 15:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 00ec1d3e7dfbbfa1f0cc4c3e026ef8f8 SHA-1: a62604c16d35746d472bf5623949fdc68a36300b SHA-256: 44cde027c3ddea98da92419210b756744c83bc3efccc8d968c276942584dca8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links to various domains, many of which appear to be compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The 'utm_term' parameter in one URL indicates a potential phishing lure related to 'married at first sight Martha'. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=married+at+first+sight+martha PDF link annotation
    • http://nadiadsa.org/userfiles/file/52847341226.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/juloje.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607748811eeed---nerebanawusezewed.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/tofufuzajaxu.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/78027366579.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/31535989548.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jinogu.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/38617192540.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/fasud.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8e6ee15179a9555b6f6579e14fed0ccd/56375044849.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/bebabaw.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf516bc61d3---55507718387.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6f5b245f---rugezepo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7563e5e998---wixulura.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c194e063e85---nugatobiwoporodal.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/54309322665.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/83790373883.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/xogivumuseruxoxanize.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090865221264---juzumawadutironubip.pdfIn PDF document text
    • http://belloverde.net/emailer/file/gidod.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090035600243---zuzimigiguxufopevafupope.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ojnapstrho2j15qo3q7n4hjqg3/navedavedotuvumezuz.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/48147133041.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/75356993018.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hpv29ig64uts0rks5pravbeom1/jezevilowut.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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 10524 bytes
SHA-256: f0136d07f99572695b31d50c917f28530a95792ade270d370f3f4754232ad36d
font_01_sfnt_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 17348 bytes
SHA-256: c229424c54858f2c2396b5d7689511876d47f1fdf58cf6dbda2cc16c9b2dab55

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