Malicious PDF — malware analysis report

Static analysis result for SHA-256 335e3ef6476ed299…

MALICIOUS

PDF

69.2 KB Created: 2021-09-20 01:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a6e5bdfbbfac7780425e9af854df8ef SHA-1: e531d4815616d4fbd643262b85e2ad724b1d0d7e SHA-256: 335e3ef6476ed2997fbae56de71ce0a07b0f92e2e3f9d91a551deaa07d9fae74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely to download further malicious content or phish for credentials.

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 https://drafthe.ru/uplcv?utm_term=localcast+pro+apk PDF link annotation
    • http://chiesamadremarsala.eu/userfiles/files/kamanut.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/83898092341.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/belidikoremuga.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/lugukelupi.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/futasekerisidefatisebaxix.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613137fce4e0f---tubazuwuz.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4b239be3113124268971f792e447d2b9/5400108229.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021092005550973499.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/47005769547.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/82969209641.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/22055001899.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/fufenatofejagakovipanitop.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631787733.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/7736379166.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/80489584927.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613703005fa54---21507513574.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/45482728493.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/riranizuv.pdfIn PDF document text
    • https://funke.be/data/file/zibuw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2d190b21---62031848925.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210917152628.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/vidowajifopudokepezuzinu.pdfIn PDF document text
    • 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_off0000af39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 10088 bytes
SHA-256: 37ef53ffaa422d6b421ca1266fd8c0fe6b0a5b3892833259f7272845a9a68abb
font_01_sfnt_off0000c5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 16632 bytes
SHA-256: 93c69d4a998856d46a9aa0d8b378123a5a823d1c1258ba0ed18bcb18ac155b5d