Malicious PDF — malware analysis report

Static analysis result for SHA-256 512a1aefea66a442…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 12:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0b044a8fc3feeb046e5d0912785516a SHA-1: e5695237b7dd02e3eef4c1147cc1f3fbea9696c9 SHA-256: 512a1aefea66a442b23a6592a20de2730829e95cea3624a698e036185fd6f18a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=free+fire+wall+hack+apk PDF link annotation
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cea3a1059adad9669e88d44e1f5b8131/65546690119.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/25322549321.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/pexatukur.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/maslm11seq61tv4aqqoenc2c29/85993115035.pdfIn PDF document text
    • http://www.ezmoving.com/file/kubutazarukofewisago.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140670e5b81f---60591934058.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e8d8897fccd104cc89c80e3b3a6b2fab/51898223494.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/ladifomefamozarevi.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/30938456271.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/56955669596.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/55549013616.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/99142068420.pdfIn PDF document text
    • http://cecev.com/stockages/files/buzonomitexu.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/24047275801.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/27188314943.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161406258d2aef---jidulolezovetusexurelulom.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/78661573434.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/janatutavofule.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/kapewiranibuki.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/wabififepomik.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286b65ad86---1156906372.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/tujukewifisukawiwiji.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/70188956177.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_off0000b93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93A 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 19652 bytes
SHA-256: 34d847fcb6c6ee547996cd4069816c886d4a444eadf6a07e2bef54ca4cbbb3b4
font_02_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 10244 bytes
SHA-256: 5cdd0c540808c83053b48b0047d0d5c3a1b0d020977c60346e20270b3ec98a37

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