Malicious PDF — malware analysis report

Static analysis result for SHA-256 de86aa29d58376b1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 03:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8b806b8cbeb953a16b0eae64a209ff4c SHA-1: 90e7824a7241fe72e7a5fb37f83d81d3c0cf7fe7 SHA-256: de86aa29d58376b1e863977c39799ce5d1eefc212b3659dda18d0981e7ad23ef
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised or disposable hosting domains. These links likely serve as a lure to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fese.in/ienupdimages/images/files/19202630526.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef087b6ac8---monusurafodafugezagew.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090203092667.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/jokadisun.pdfIn PDF document text
    • https://fong-cai.com/upload/files/lopoguranapep.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/mumakax.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376530058bb---zabusojilinibu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f0a64bf7c---24176674144.pdfIn PDF document text
    • http://beiks.info/public/file/kuteninivevud.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/11137417706.pdfIn PDF document text
    • http://packamate.com/userfiles/72470826545.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/zogetika.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/10691144992.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1f4b4de56---97077755631.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210921195142_1227100145.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/dimixa.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/pasizajurividulejaxi.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/riforuruwosejerokolilek.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324dabe107a---sexoseru.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/sagofifomijikew.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/gemidate.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a6192b0f7c9a55aed2885a2e4f6c5fcb/vikasoxorebakefebivur.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/lupix.pdfIn PDF document text
    • http://millecolori.it/images/file/jifibikoxuvubopijulu.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/puvezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=jarvis+apk+for+androidPDF 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_off0000b19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 16712 bytes
SHA-256: 079195625d0cdf0f8c6b21cbc565a1f12405e79091b3c83ca6540532c08cfd32
font_02_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10364 bytes
SHA-256: da77b13a9fdffd08b55a76f4431d642693da4dbaec8117285d45b7f5b6b907b1

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