Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6664e9c6b1a1700…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 00:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a86459fc39b919c33165e5bfcbdb09ff SHA-1: 31ec8a13ffd397eb57f97c18125ba24cad383547 SHA-256: b6664e9c6b1a1700a3a2575973cf0555642c74b826102be04250a37317025c88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=gored+skirt+pattern+pdf PDF link annotation
    • http://www.deep2001.com/images/library/File/muzujosififibifitiragaxi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e27333e8---kidozadubezozepobepirix.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/62226138838.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/24807951290.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/nutetizotefiwedarerajetes.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/995619aa16e5c29cd483e522e5b40799/kozagevovan.pdfIn PDF document text
    • https://zhansq.cn/upload/file/befapizisot.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bbd3e254---74528843433.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/91251720199.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/xuriwapi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256b2c8424---fubifinatoketewomevovati.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210728062827055.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/setenixilekiwu.pdfIn PDF document text
    • http://talesma.com/E/file/10411219861.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a5f9fc108556bea62ee44e07f92e6a3/77000299651.pdfIn PDF document text
    • http://midel.me/userfiles/file/xuwutilikeko.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160907a829fe28---44475544918.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/pisun.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/b2cc3b3809edc3eef07da80a4191fcb6/15611198099.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/17174979466.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/59853508983.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/85657396523.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/l5r505p1ruobtu9u6fhreq7n02/26082493070.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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 19036 bytes
SHA-256: 6d751e45849743ad6cc4b63284931f35add109d71dfb482d3a88ddd1e9083f54
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 10576 bytes
SHA-256: 9c060a6f82aac50cfa6721114f2b7897b3d68a3a4b05f116aa901ed226a576e6

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