Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d08cdb5daa20446…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 17:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a45cfbdabcde1804c9ae911a1aac48a SHA-1: f21d3aaba3b40f36c4e346f6e890dcba38bde08e SHA-256: 6d08cdb5daa204461f37f59c08a6fada1fb566e232fddd756efb6a232065f88c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, potentially for SEO poisoning or to distribute various malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=unicellular+and+multicellular+organisms+worksheets+5th+grade PDF link annotation
    • http://digifast.cz/userfiles/jokopoxafipejo.pdfIn PDF document text
    • http://mayjack.com/upload/files/viderisiwo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b3089abf---63797952735.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/nedora.pdfIn PDF document text
    • http://strandedtattoo.net/file/61011368808.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/kekupuzafetupevikif.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/11183553846.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd06907d5---16755828565.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/80339389895.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/zojosopujagupiwusa.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/gagirujaxuroku.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/29f1a02cedf49249738b47a5c62dc15b/sonuvanijepenirawuveweg.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8a18963d---35633287610.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/22839730103.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9634a7c0d77b71765ccd68def40336a3/23358210803.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/67867223837.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/jufapajutugulusitekelijik.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160945cd1e2576---sadegevulufiwuzitubiwapik.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/zoduponixukebave.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/vasitofupezite.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lezapikuxibamajobuk.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/72464300099.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9ba58f439---fisosarojetosiluzafeb.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437682ace2---98003086342.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/tiviruxitibumutolalagofo.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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 18112 bytes
SHA-256: 5b681c458f84f0a07be438124ec9099c6e48428e72320e7958ada5bacc5fc7c8
font_01_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 11236 bytes
SHA-256: 3a1441dc651c3f8ddf934ffaacdf8082a93185dd0213daab0cb9f13f66583b54
font_02_sfnt_off00013e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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