Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e30b8901733fbd…

MALICIOUS

PDF

102.9 KB Created: 2021-06-14 15:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ad5d3a952bd97c9cdbc56d21b7809208 SHA-1: 66e681a738083e2c254359e243a47caba3be4272 SHA-256: 51e30b8901733fbd5544d02e8e366ba53924043634a23a43ee25e2881d5b46e9
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krisoc.ru/uplcv?utm_term=touchstone+workbook+1+second+edition+pdf PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607682069d33c---wesejanonozavi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jalibejitexaduf.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b6b2cecb3edbb2d369c1b809192f8f00/bemaxakudefitomes.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/37040856946.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/20788e2d8e134b539561b148708a505f/xomomobe.pdfIn PDF document text
    • http://soupworld.de/upload/file/simewenamiviw.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/44194392141.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6f1f815432cf46a5a591a1f52ca45d9f/wabufaguxusokaxizapuz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c426411c38d---raxadodogeru.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703992b47b1---83555149521.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160806a8c6c5ef---59079627698.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/df92341e3bafcce6107b30724c90c3f2/dugizikomafu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/17fe95b39117af5819e9687fd73b5d80/feseloporixosobevibujewir.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/gh922ce9csvd0g1imshncqtt7c/89882094001.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/r46mhnha1td6n08n5ke0amj2p3/58732982351.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/19263744080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015405.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15405 25500 bytes
SHA-256: 7054114c49cb4082b1805cac5e7f8e303afb19b06eebd07e190836dae0a60446
font_00_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 5180 bytes
SHA-256: cc19f261fe92dd41059aecf6cbb32779e283b73b60a2317e87a17f1190495472
font_01_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 14596 bytes
SHA-256: 770d75338cbed7f02dc056a2b4e867e5d4df0034070bf08c7d295e421a9b88e8
font_03_sfnt_off0001802f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1802F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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