Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d87521b8876052…

MALICIOUS

PDF

78.6 KB Created: 2021-08-13 21:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dceb6c546b20e9b1ab6616197549a008 SHA-1: 7b76455c4f3d9734c35cfde5eb1e1d91620a8318 SHA-256: c7d87521b887605289903eb3653072a86cf5dc4135c2d611dd5b170e1a272b89
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=reading+detective+rx+pdf PDF link annotation
    • http://thailaundry.com/imgUpload/files/lijibusokisisebemunefa.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead1f29d8a---rabibulufopabodasaxu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ooa6ea6o9vkllrcvn68qfs6mu1/1126234051.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/47948252715.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/33120071307.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0bbf9a7cd8af1df06a540ad508ec030d/nifumupive.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635a872dea---57723626310.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/10699047178.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c803c32e2b---mebedolumap.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/ruloxotibeware.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/66732425459.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/30310403536.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/dusurewuxizasu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2f3de04e39bcb57cd9813c47eabc07a2/pemadagozixitolomon.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160709046582b1---wurejomeveso.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/kenesiwakeve.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072541958698---bakikowabapiferonegegogun.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608982b6e1b64---futofelibixebizaxiwiw.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ca58192caaaf6db2272cf2abb6723a61/godoxizafoxedavurap.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/kafidimubil.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/73254262322.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_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 17808 bytes
SHA-256: 5a87230fd0b3b9bb78327c27f123a9016bd4aec8b288e9a5b7d1c38e306e62a0
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 10676 bytes
SHA-256: 5ece32002262066b2ab128300fb7dbee762228061aa3fc25bfaf5c93b9af449b

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