Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b9c3574d8f270c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 09:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 634a5f2ab037607fb16fbff21840578b SHA-1: 4c1cfb3bcc71a0fb16ef838e803d2869f95eadb4 SHA-256: a8b9c3574d8f270c4882946e7077d8e6ba8865a25a7088eea003b580db6cf5bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://njbeihang.com/uploadfile/file///2021090619574823.pdf In PDF document text
    • http://www.edgartownschool.net/uploads/files/vesikevatomuxazawazaxila.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/kegilafo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0r1t6fl69e44ppll3hg2v3rs8b/64863872546.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144c0b480e9f---12431898617.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/fubilevewilububawowuduz.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8760b522---34425081959.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nekojozilunupij.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614479658a886---vaniluzipapidagumaju.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/95313151098.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/kefisonulixipusede.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/67867394057.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/fafikulevasabakoda.pdfIn PDF document text
    • http://elitvorota.ru/f/file/niviledebaju.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/vezolurugoziwet.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/35025606178.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141398c9be02---97397416097.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146867eb35f4---94088064621.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/buregilavarevoduzezamo.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/92366573756.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0352853001631356152.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/xerujozopijejolarug.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/wevutedokupuvopujojubami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+android+chess+app+to+play+with+friendsPDF 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_off0000aff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 10968 bytes
SHA-256: 6489c385be9da544a7680a5ec36004c70685728484aa3f5747e858611f46a4e7
font_01_sfnt_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 16220 bytes
SHA-256: 6d4f27bdba9ed63eacda3fa93d3f86e0d2c2aec6367957f05e47e72ec491f888

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