Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f433084c9fa074…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 00:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08fe7d656f83d94941616ab43ef91ecb SHA-1: 39b17101c7a64887ea60ff39de7f435f0d79ac84 SHA-256: 94f433084c9fa074547f99cc16065ab8d0b947baf38d965f8ae061aca71af420
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous links that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, forming a link farm. These links likely serve as redirects to phishing pages or malware download sites. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=including+but+not+limited+to+abbreviation PDF link annotation
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/22381951779.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gpq16064skqsa1ndhrbo16v711/rolebad.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/migetobipeniwudixirekulu.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/tudigedojobuw.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/jazoxanok.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ce773d4f85e212116596ccf442a303fc/melabufawifeberepu.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/bewizuzibejimiw.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/fdor5m3ut32i2c0qqaohtm0jo0/12479726602.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca43270ffc---fegos.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608736d3455bb---mimawajijujilexejuzedare.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/cd8b6823c0b8f5a254a8b2fb83fdb4d4/jowijovesobudogima.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b6de4f7c---51965986426.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pasp7sk298fk29bgq9h65mgki0/lagoxitogelid.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607298e7216a0---bosuramunejumilotu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d714157fc---wefojiroteselivanokawesis.pdfIn PDF document text
    • http://nscenter.cn/upload/files/pikosopelezipevenovukop.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161157ad9cdf69---84805649690.pdfIn PDF document text
    • http://stisk.com/file/sopexejiloteg.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/sefeleviniberutelapin.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e6b2da56---rawebenobepewedizi.pdfIn PDF document text
    • https://irantruck.ir/data/file/ziputo.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/vumapuwiporaxenomar.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/9354033297.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_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 18496 bytes
SHA-256: 6efa3a71091b16f8fae6b6474ab6323844f4c4b8b9f147b61db5dfc80e1c7a4c
font_01_sfnt_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 10804 bytes
SHA-256: 365ff151fe4d1a7bb326efc12a2c9864af6ee8221f19775470fff7d94f682707

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