Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b08cbaa7dc6853…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 15:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 40e64e72ebb9a13a2e670789c89fa528 SHA-1: f1b757566d7c7e228e52e72fdf2c673b6714f008 SHA-256: 93b08cbaa7dc685330df9af2db806e02e24473f7aca41b365c1efe4e7518a9fc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content or phishing pages. The presence of numerous distinct hosts and UTM parameters indicates a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7bb2bc2ee7f4cb6c643b74eb76442011/madofewosiwibugabemu.pdf In PDF document text
    • http://cortabellanews.com/userimages/guzoruwuwagadagagirarew.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/98ebd262463fb8065bf82a7b388f4734/numowavusekogobatoruxe.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/dasejikikedokisif.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/15641139759.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824c2431e0d---70537245037.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/lepujenewumojutenalo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb68b9a3491---91422128532.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/m3h0jsojf38lg98dngbg96qq6v/49372074046.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073286a3de72---welaparix.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0927fdce---60175269176.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/21504172858.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/be0054f740012e49f4436e6701ea4fb3/17698345875.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ffd9b1b5---15989724927.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/novujifawejunitovum.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/8914467053.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adb11442fb---sefisa.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/85221000556.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/u29p2jpv8o72hu84du6ev9tf42/62649153721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jesus+the+man+and+his+workPDF link annotation
    • 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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 17336 bytes
SHA-256: 4ef3f0bb256e59b9c1d70ae111e3c24fc7b48cc7560d10fbe541275341d7f761
font_01_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 10736 bytes
SHA-256: 54adcc663340aa54cf5a5e0cad314ff7a81c1aba2e7d2e7981332402a1cc3f29
font_02_sfnt_off00013c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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