Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac4c659c272a4a5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 06:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8661a6b4e1699570b6c10d6f99b6697 SHA-1: 37ed405c0bb96746bd00da4dc9a8830f0150aa1a SHA-256: dac4c659c272a4a5e274ee40522bf61a377fcf1e179fc84c59c291aeb99c4159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites 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. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=hepatitis+c+in+pregnancy+pdf PDF link annotation
    • https://basealimentare.it/webroot/files/fck_uploads/File/73600619117.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/loselatixovifek.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f911974a29---10148120647.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/sefejogip.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078141f85e31---fabasu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607465d79449d---debexozosikaxobifav.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/panumidemoveruboxezed.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/77234595407.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a85ff01a7feaad54ac272d85757a7884/64645921258.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/fikutifaponuzejinujufev.pdfIn PDF document text
    • https://0900107678.com/upload/file/zidazutojonajipimosawi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/80663202207.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a934311ba0e---bawege.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/62361508388.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/72008201755.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e1177dc0cc77e10ee19d52739ffc2c3c/kidov.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c14cf57de4c8e15514f399e11c7daf2/18645206391.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/pogefedexi.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/19087206527.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/vabirixujej.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ueasoob4te3d1mc4uvan49ao1j/tajimipujuxomuxadi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/68799375926.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/58404530007.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/3599507405.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_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 18108 bytes
SHA-256: e38b3ca3ed56c893bf1b55ce0d62949581888d40e9fc3ad4f00dc52ba5e88cf5
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 10736 bytes
SHA-256: c43ac68b00d459152eaf029ff0b84d4a0b8ef111596ffcba0c92ff6289ab918c

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