Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecfb99dc51ccd91…

MALICIOUS

PDF

108.6 KB Created: 2021-09-05 02:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67fc29d6d24e59412101f032d80587d6 SHA-1: 57ee9036f2efccee21cdda98624f9494d3542ce3 SHA-256: fecfb99dc51ccd911cdd3ac99996d3439e705e3865db26ef62f14753df0985f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is likely responsible for redirecting the user to a series of external URLs. These URLs form a link farm hosted on compromised WordPress uploads and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://leise.ru/admin/ckfinder/userfiles/files/57101281748.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rudubunonefamugaxubagagiv.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/gezunoxugubazedulasara.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61a19bb6ee---55292885580.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/iuc4ds0kjmq2hgpaehimjckuns/foxisosim.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/69779809224.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/732f8e845c639db635dfb2b68fb9a8c2/46190746096.pdfIn PDF document text
    • http://novichiha.ru/pic/file/sunivubivodos.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4p6ri3vartpr1p8ltc3n4adf2r/5771542969.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82d569e9f---lawijasiwaduwalatewak.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/zewotok.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a982f1ac61c---jokazutinoxepowasibebuzi.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/5ad6676c814acacde96db86cbbcbec88/xabor.pdfIn PDF document text
    • http://polkovnik.su/upload/file/femebifonolibinivurifawon.pdfIn PDF document text
    • http://industrialdevices.in/uploads/duguresorelimuvanigi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aca4a5675---zuxibewena.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa8c42fd0e---41701503996.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/bogovuwosezagobabur.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/fixazutopu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608462496b0d7---firiralanerojodigudagerox.pdfIn PDF document text
    • https://italvaping.com/file/80083415547.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608154be0d24f---75785352943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=education+problems+in+the+philippines+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_off00014228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14228 18724 bytes
SHA-256: 41a76551447a6eb578b8361f8f54c145caf787624b5b6b8c63565d5d2bc92dfb
font_01_sfnt_off000172c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C3 11108 bytes
SHA-256: 38412c13386c57fb29a22e88fda6aaba926e70dbd41b1c9cbfd36f65ef1c839e
font_02_sfnt_off00018c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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