Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b5bccd2e1be0ad…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 22:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79e923e8613b7f6e23e7e4b1b92dd7e7 SHA-1: eced74d5f2da956765bd6543be7f78eecd68d288 SHA-256: 88b5bccd2e1be0ada66de655bb1d11b33a3474b7447b3f67dd6be584e034e9f8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS upload directories. The ML classifier and ClamAV strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The presence of multiple links on potentially disposable or compromised hosting suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cariboohose.com/userfiles/file/japuz.pdf In PDF document text
    • https://gangnampools.com/contents//files/45774517687.pdfIn PDF document text
    • https://kultmotor.hu/images/files/bejutisewulevolaxobal.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/292155415092.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/nasas.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e689379bd---55131033107.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/xuneretexinatokajaxe.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fa85fcf0a5cf4c1933c80a1a5bdda2dc/niderisatanuwituradive.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4bfdf4e7---81419084230.pdfIn PDF document text
    • https://actor-conseil.com/files/file/bujupafakegi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad460ab10db---nuwarumokijiru.pdfIn PDF document text
    • https://mfdesign.hu/files/file/batumonizabujakufovom.pdfIn PDF document text
    • https://basisnomor.com/contents//files/pidavomulakeluvuvisozusi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ali4t38c89i27p9oto888ldnkh/58134913763.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/naxoketigefewoki.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/rizaxitodawewexareritoli.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610919f52f804---76448647277.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16103048571f54---51084573564.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5c04a5b6---71760405574.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1121410188609ce5345a576.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210705091027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=strategic+cost+management+book+pdfPDF 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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 11224 bytes
SHA-256: 3dc31323434f96b8d1afcfe3eeaf186afdf998c556131237943944ba02e1f185
font_01_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16044 bytes
SHA-256: 7baafc583798f4f50e111ad7aba93e282b6feb170e91304b6e2582050e8f355d

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