Malicious PDF — malware analysis report

Static analysis result for SHA-256 470976856e101798…

MALICIOUS

PDF

85.9 KB Created: 2021-07-13 23:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1cbf44d233c04425ca275d26d6f87d17 SHA-1: 6e9c816a83cd3e2ba1a43cae4a55556bfca25b05 SHA-256: 470976856e101798e690139b6752cc61d1d8385aa09463a51c45bb2f8f18fdf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=do+you+italicize+newspapers PDF link annotation
    • https://gtnet-engine.com/ckfinder/userfiles/files/tokutolibetib.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/84457450756.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/gojijutixot.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/sujexiwel.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/denobupuvesoge.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160858f22ddc50---wakivewozufoj.pdfIn PDF document text
    • http://dogable.de/userfiles/file/51338412024.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66ccd7682e---sowepija.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6410f7e148---sekixexugogenu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/fenojejekalavufepeso.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/zujowexi.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/dojuxutasofekiwosibamesak.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jawobemopemi.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/gomutorovezuvejatawo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/61913427972.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/315e47e047f18cb0d02e1d61e3dd12c9/72702872952.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943755015a0---15890054192.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160839f1a0f516---bebajovepolujumov.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/xolixeweworo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/bf152b59e51f05c6ef30ba5153076490/10401265980.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/soberev.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3def426e9d---rofotogolizodaru.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/kuvuboniwodel.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_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 10728 bytes
SHA-256: 7aa2facb78ec1eb0789d4ae940beba777e19ae0a73dc68c9baef0b6cc4097a79
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 17308 bytes
SHA-256: dc35ea4aaaa0cdfbc9d00c9d8cec42577492e80139074359c5b9e853d97ec0a7

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