Malicious PDF — malware analysis report

Static analysis result for SHA-256 111b9e98e16bec1e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-04 09:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09dea9cf1f9a491a6797f100dad2273f SHA-1: 64b7189fccd812223716c6e6591eaeb5c991f207 SHA-256: 111b9e98e16bec1eaef30230284f8527096d9b473bcbbe6bd0ecab10472774a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=maine+driver%27s+manual+answers PDF link annotation
    • https://kalyna.ua/sites/default/files/userfiles/file/60894524606.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/nokilaxobag.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/36717489584.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49d55aca3---sozaza.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f68262f23---88826034775.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/29439229425.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/mojimexomozotafanene.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/76789640179.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/xinuranusilaror.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/wojukenumi.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/57825030828.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8480252836.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/22721334865.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c747150114---22943437781.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/dejewidas.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/tesojunodirivenedupupam.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf3d11bf7---mimixanepalorozojuxi.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/60664057671.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/960a018bf42f634ae1ec95195a062a7d/gafazu.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/48131628430.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/soxuxubitopumave.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c17bfbe3a3a---gorupagavirejabedozef.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a88ffccb732fb53a2396897cacf7453d/zumezub.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f0257c066cd2ef91b3569abe619563ff/67551097665.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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 10472 bytes
SHA-256: 0d8ed802e84ee6be3fb12932fcca011b5ccaefbcfb1e0ab129bfcfd62e214737
font_01_sfnt_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 15700 bytes
SHA-256: 66cbc9a9ebea7bf7fd3f4be50cf9d076cd0deb8c7b177963998220adf5489eb7
font_02_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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