Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84b51aea32efe78…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 00:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 485af63c5d0ca745b8152724ad3802cf SHA-1: bf222265654e45d571082c1052b056d8539adbd0 SHA-256: b84b51aea32efe78f001e6e2f3b87937c017f31cda5895bfb8be9cee72eddfb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes a link farm pointing to compromised WordPress upload storage, indicating a likely attempt to host malicious content or redirect users to phishing sites. The presence of JavaScript suggests the document is designed to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609846a121f56---3074439395.pdf In PDF document text
    • https://zionapostolicministries.org/uploads/file/sanukaluzujexamixuwos.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/11289180908.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/dokisogoxozoji.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jc16m31fvfuv1lecjs2apb3sl6/nuvupunosu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/samepi.pdfIn PDF document text
    • https://baongochoa.com/upload/file/limaperim.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-16/images/files/71223432659.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/80707561179.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609226ab143a5---22510704296.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jsvu342s02l7j4mike8rieni06/wiwewodigurijojowojo.pdfIn PDF document text
    • https://abeess.com/userfiles/file/5859863417.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9467eb789e---38285118222.pdfIn PDF document text
    • https://duel.pl/userfiles/file/85792708302.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8251e1232---sepasavex.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/40400748051.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee01d66ddf6---33930318417.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87c7fcb6691b9bbd13d5b887e4a690e0/51286271589.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/58773433607.pdfIn PDF document text
    • http://gptools.net/userfiles/file/55247082084.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/bozokipamiwu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/39ac291f7a69d354a2d524fc6d699fde/gemesu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/kugexofusafizirusuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=java+multithreading+pdf+tutorialsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 11104 bytes
SHA-256: 3593214f18c09dd4d432eb0ba5313c7b54d27b01bb5ab7649a722a74315d125e
font_01_sfnt_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 24108 bytes
SHA-256: 2d4f3c317fc0bd20b2c5d114bed14ab33140207eb8d25372795c48f9be915431

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