Malicious PDF — malware analysis report

Static analysis result for SHA-256 33704cce2eeedef7…

MALICIOUS

PDF

95.1 KB Created: 2021-09-02 13:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1528999f003e6ee0ceaaa54c77868e4f SHA-1: 3426b266af15c245f3a7b2fbf10ff573622e943e SHA-256: 33704cce2eeedef700284021319cf60042ee7bfdd513e348de4494941371859f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=atlas+copco+air+dryer+fx7+manual PDF link annotation
    • http://adria-ex.com/images/blog//file/74687854953.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/96680460461.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/movesapo.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/jamipenaziwilom.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/kepoxaresadabu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fcabc13d083d3926a0a2b8ac381d7116/sewuwajoboburelaxusip.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/gulotokojapopiworon.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/serogerijami.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/15887541916.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/26237269961.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/firazakuxaxidebazejujosow.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4835eb899---girusazisomonet.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/n1dack396ni70bq51vtut2383g/35762877685.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/larexegovapamaboweluxe.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/b37393b149c44068104c018251c27cc6/fijefepituzutoxusasile.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b7aebc63923ff12e5a41e7302df15b69/24168769124.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c08232ee---vijosadiret.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vqbp5os9vhepkgj8obr9r4qh05/xikegalazugobitorife.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/51540247165.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/zizex.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/84528639647.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/41998000258.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/16597310907.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cc1ccb983---lisiwenikedowugalevapog.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/barelaba.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_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 18060 bytes
SHA-256: 7de7bbc72a34a26aa616c9365380b9f58f6e3bbf91fe197dee6b5db94f44bf84
font_01_sfnt_off00013c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 11128 bytes
SHA-256: 66f22efb489ec04e0dbe6e7a40d79fb49818b620e1c2f57c0d47f3f00b396d83
font_02_sfnt_off00015650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1