Malicious PDF — malware analysis report

Static analysis result for SHA-256 416fa5ce3d5e5e9b…

MALICIOUS

PDF

73.8 KB Created: 2021-07-18 17:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f205288ef82a4e33f4a81a17e5fa49b6 SHA-1: 5c42e2dbf72620b3184cf5a614603ef38e73381c SHA-256: 416fa5ce3d5e5e9bbb06dd911e989c034d909b134f285c8ceef79d5f5b78a252
156 Risk Score

Malware Insights

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

The PDF was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fuoriscena.eu/file/pavire.pdf In PDF document text
    • http://x-site.by/upload/editor/files/xedowivafu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac587bf1a---70490903673.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081451894ad1---mawuteju.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/tutusifuwipemek.pdfIn PDF document text
    • http://jar-ted.pl/file/64288543858.pdfIn PDF document text
    • https://adikkedua.com/contents//files/26600623166.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2e8a7349---pezurifivenafowagasoxor.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d344211988---navonerilovixa.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/zinokobekimikupagoko.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/37229367287.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b733b2b08---55808456763.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3105219a10---dirivizunonapuwugaku.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/sunakovoxajevodawa.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/zemipevisemazap.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2435573acd---85327521027.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/81064236788.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/d1999d16a35ff3ae7d182c5f2626c79b/75018935522.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/67570653722.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1d7eb4d84---36561135688.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/wuguvanitomim.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/653vo2vjob8ahk4a274p8kmrs8/penadomeseperedikafef.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090827173e9f---limuvokisorop.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/zenagogoku.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6479cc456079cc1071fc75efccc08eec/mogigasilijoxawitobadix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sears+kenmore+washer+manualPDF 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_off0000c001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 10536 bytes
SHA-256: 3a0aff48bd8c4c97e95e00148143a81cec32511715fa7255fde4f96b1c31b7ce
font_02_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 16228 bytes
SHA-256: 10934d87b2139708807f7dac80f63c695ddec481f0a263686816118b6b5ddbf3