Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc34c7640af98cf…

MALICIOUS

PDF

78.5 KB Created: 2021-08-14 17:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0efbf5c20f614281174c13d89a66dfa4 SHA-1: b7b001a41a5864a91b2d8533a50e2e0df4c428b0 SHA-256: 4bc34c7640af98cffd28044acc2019219c37f9c2d0cc279ca78b9c9a11d6cd1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f41b8f788---sivomuwejovez.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bd4d593314de1faffac32ed1fa82c9e4/jobawuxejamaworuveze.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pc4ioms51hk628u5h0ifpuj994/77739626823.pdfIn PDF document text
    • https://isosklo.cz/uploads/jifomasemigamus.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/wagid.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/eigh9na2269o9rqgcl4habdqhi/58380905763.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fb3b1e6b308cab8a45ea663565c1f7bb/12483211350.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/83373649791.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/jatuwajobamoxole.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2918bfd3d7b904facddb192c50bfa3b4/35565107374.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/tenegopozoto.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210714124435.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/zapideloridirojupuxomir.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/kkf7ic31bh7m65odskc9dbkir7/savabobedowe.pdfIn PDF document text
    • https://fultoys.com/userfiles/nimutixo.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/v1rmq7sr7oj84186m5jcnvdgp7/47730361142.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/uapk4e7u4pvvem7dpnjlf334s7/45107234429.pdfIn PDF document text
    • http://esistore.be/userfiles/file/mewaditaxudogokew.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d565e6c814---daganexatigamisokokifamo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607611199c89c---sarolivefe.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86c8a4c0d0---4784907504.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/bivovegoruxepumozolafolib.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/kojefikukisasa.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/5022416244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=istikbal+g%C3%B6klerdedir+oyunu+full+indirPDF 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_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 18652 bytes
SHA-256: e97dd98962730c4797029b97d38574dba142e4519e0fd8af4c8a8dec36404f9f
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 11140 bytes
SHA-256: 3b41c6a4ec5dcbffbd364130a008b6e6f287b20f41c478345d8e63f11023b349

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