Malicious PDF — malware analysis report

Static analysis result for SHA-256 def299c07b01b2ff…

MALICIOUS

PDF

100.8 KB Created: 2021-06-28 06:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c4daeeb2512e540ca7c1a3ffcd92f859 SHA-1: 84a735572c4b3fe4fc4cc411274e19c00b843c88 SHA-256: def299c07b01b2ff7376a9fa4e7036d45b81327716c0a6bd6646329f33232fdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=apply+for+second+self+employment+grant PDF link annotation
    • http://drsuthichai.com/userfiles/files/febexamusirofilat.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8e2ea7a9967f0d4e2fe5becd979ca350/kuvikuxonulewibudixu.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/68920297324.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/gajokumug.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6f3ab769---kavimuja.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ced9c7170fe2609c381964f926480de9/gesoborezat.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/94866075011.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/11084823460.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/ridakavanuvogekofanexa.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da529790f4---17291373084.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815ee862484---83642460968.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f64788425eb6e98b0c415ecf604ca581/sexepopij.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5b6d4fce---gugaxibewugevidotagamitod.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/52eac7e298f09e88c1a33f7aa4983ded/wurafadukazomeguwalekufo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/undhgmuiofthhpof8lau02vq23/jegati.pdfIn PDF document text
    • http://ruresept.ru/files/file/63033156778.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/nijemunafomogowejepubuk.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/85621100465.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1b275f7a8a446fb606d629e6f546cc76/60776934244.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c744712b1ee---41269960303.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff3c5ba55---47765362479.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/lelijaz.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_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 17520 bytes
SHA-256: f4b34226d7c70e04cc1cccf2697f8580c1b8f6e1a3e433d99c5d80ccee9693fa
font_01_sfnt_off0001543b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C52 10968 bytes
SHA-256: 0947aee525e9113e3572147b46d2a3f4fc6c07c510e6886d2438c9bc1d0a1310

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