Malicious PDF — malware analysis report

Static analysis result for SHA-256 90da5b842fb77c48…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 00:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2f76d8af03cc4ce3314de577eca6b4e SHA-1: c973b0a7c1c652d4dc93a85632cb020a7f629d95 SHA-256: 90da5b842fb77c488d4400ffc3bfe41d6a5de7dcd2bfee7e97981738459705f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised domains or disposable hosting. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

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 http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccf0292f8---26864856093.pdf In PDF document text
    • http://lor-rostov.su/userfiles/files/93669998172.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/vavinamamawipokezovofusik.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/70818598467.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/lotolugexusezoluwesej.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/jexojokoga.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/jojarotuzedewavexux.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3845461626130bc25721f7.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/37516776541.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/78876378402.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/zilukivalejixebudaf.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac6b3ba34---digufisigu.pdfIn PDF document text
    • http://esipro.be/userfiles/file/89920931332.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a57ae0de191f51697f57a910ab5d8f84/47971939138.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/pebewo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f085bb69d0---39128959586.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/nofopixobudoligawukuxav.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/42219803839.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/71686122433.pdfIn PDF document text
    • https://raljob.com/userfiles/file/lekoti.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/48274137386.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/junojufon.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/72540645423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=call+of+cthulhu+rpg+pdf+freePDF 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_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 18000 bytes
SHA-256: ccaf123727eb850c0457530b9c6811392ccb316c662406af9eb3ad1e926e6d04
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 10668 bytes
SHA-256: 2d41bdf9f3cdd375d9ca4eef67ea60afe6cbc5d159262739f34298da7c211e88

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