Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa24f936ad5568f…

MALICIOUS

PDF

410.9 KB Created: 2021-06-30 00:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4d3e5eaefb36f02343c6e7278baa3372 SHA-1: 989e35481483270ea3bd67f3d8f29f28bd7f6062 SHA-256: 2fa24f936ad5568f8bb1316671c9fe0370f54c0ee2c02f0ae6fbda25840a7d3c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates an image lure linking to an SEO redirector, further supporting a phishing or social engineering attack. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://kiszelyugyvediiroda.hu/docs/file/77598062935.pdf In PDF document text
    • http://nhs1980alumni.com/clients/878257/File/zuwigi.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/60805029184.pdfIn PDF document text
    • https://langumeistras.lt/i/File/lapopitax.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba649609ebc---59750627267.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/37383925190.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d774b0de---87425820095.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6cfd7a21f153ff5065340a4e2a130ffb/keziduverekorivena.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/39716656037.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ccf424fefadc614e318c42689f1207d5/22052318400.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/92548176181.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a51988d4---35611561161.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/ab930ae40dba838c0f42c7a4a80c08fb/wetifufidon.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/judamatulow.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/mobifubuminimenavirejopup.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2314a0a5d63bc2df97f7f40770e3c088/kesilosu.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/73948603913.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b2ccc105326701d13fe2ee3f656a12db/63583510307.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/64449819901.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/96dc4cce9872a52723046862f217667d/84393058468.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39879533ef6f96ee2ffade713b9a2fa9/lawubekaj.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/fd5f594fdbb572ce7e05307144db78c5/dubabodi.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/kuwivotidokefupadosemo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607854b73e9f6---75147440314.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c7630475---kepunoziromuruwifobenefu.pdfIn PDF document text
    • http://poiskvod.ru/images/file/8600665276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=applied+multivariate+statistical+analysis+6th+edition+solution+manual+pdf+freePDF 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_off0005e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E928 11316 bytes
SHA-256: fc986f33693dd700f9373444cf3d3feb0dc39a657b7bdf44a2cd96ad335c6ec1
font_01_sfnt_off000603a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x603A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00061bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BB9 27896 bytes
SHA-256: 1c8294e624f06ef346efd85281c9a2740b9c7917dc7247a27975cae937482931

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