Malicious PDF — malware analysis report

Static analysis result for SHA-256 690880e6e4ce3b80…

MALICIOUS

PDF

83.6 KB Created: 2021-08-22 03:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3335dc4a3c7e0a02db29ac2d770b584 SHA-1: 442f984a82506d44ab721d3625fd890171d8f4b4 SHA-256: 690880e6e4ce3b80de9229ce17c48c5a2bafe4d41c2996a329e3047d48090dc4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://susasoft.com/upload/userfiles/files/jikevovujefaboxo.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aaf8b1522---45562308324.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8bn3d2a1cfhcbckdpd36dhnof3/janiwelumikesisogabuge.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/viwaduwojuxemidutepovaj.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081b000d21ba---roliwuzafuxap.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/korurimixu.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/siwufelel.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/gegop.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/tojdbhlg41mep6jhekokfgfc02/xelidajudesatejerux.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6691620aa---32282227097.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/44798509511.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/vativas.pdfIn PDF document text
    • http://usmleworkout.com/files/file/11399484172.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d6978a5e---vogaketunotogilajubod.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/biketazenajabigixufaw.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/mubizelepobapibikinifuwuj.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kojaxaxu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0ef0ca3a7fd326a7cb203e9c7fb64af1/kitapemevowagozu.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/supilajutu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/177ca0ae1250f5e559a0560313f78789/14300443770.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d6b01fc00---14581878244.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cu2mfj6v5h258mo82flj86qj89/kuvosojaluluwim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=besiege+android+gratuitPDF 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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 17920 bytes
SHA-256: 0874ed6cf0fac0ea67d3ec5e8cbe38d1475b3d20c133c80f28c5898d5c7b9160
font_01_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 10532 bytes
SHA-256: a8135801129b197b8c67545b98f834c510b589339e993423af0a408e64f7fc04
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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