Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5eec14feaedd29…

MALICIOUS

PDF

103.8 KB Created: 2021-06-28 00:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 362233b6a11124b5f29c9033cbbdea5c SHA-1: f11d61d7ff2c8d24d0b867ce518f232610089667 SHA-256: 0f5eec14feaedd29650d060f482d4be22c582dbc1376bb93b87e5a614f3a6fe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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://laborke.ru/uplcv?utm_term=effects+of+tricyclic+antidepressants PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9hhdqe82bc3to5je0huvjr0ob6/werifenemipizamu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/38126123571.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da98c84401---jofemikuwotokil.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210605_084211.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/taxudug.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/puravapanota.pdfIn PDF document text
    • http://msiutilities.biz/documents/tesimuwa.pdfIn PDF document text
    • http://carszana.com/image/upload/File/piforawupirunewumop.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/43148890626.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160807cf128158---ruzagovaxanilotuxe.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/03lb58spb3vh23t55or46pcjgg/79468106485.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e49832d92d---rinelenimujujafibes.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/006e62199ea80cbabd4b0478549bf512/mowutikujemofajeko.pdfIn PDF document text
    • https://777mto.org/contents//files/41916896313.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/83747903627.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094039b53441---wukafonurut.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a8b09a0da---21115705328.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8039ee60b---masite.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9a4f449422ca6c012c3ebdb234f48db6/zulavapuroxe.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5f7be81c---41059615113.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/72079380770.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/759f87815702b982764df334278fb923/1768771966.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/18052890.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7j0mg18iteusf8m3vf4alv7ljl/34291220692.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/6354962414.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017146893b---86541195744.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2736f8323c---38400105969.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 17320 bytes
SHA-256: 0c9c4329ded27036180562ebaf3cc0a62f9defd37645c77f2f6e9c0c4573aee8
font_01_sfnt_off000142dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEE 17920 bytes
SHA-256: 6a531e77044865578e8de33615662f9e7394dc1dab08ad42d96dabe94392dd82
font_03_sfnt_off000176a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A5 10708 bytes
SHA-256: 2a55eb93d231a8af28dd42155ed9e0c642566d20ce233da1b96ebeb73b24d869

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