Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bb7c3d5e139ef7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 07:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68e9712af7c19a617c09b44474462ebb SHA-1: 9a1c6fb81084d6edc4066e34ce776b9eeca09b0b SHA-256: d2bb7c3d5e139ef750b086da0e6627d43e754ae21a63949b93699252d22ae55e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these sites for further exploitation. The file's structure and link farm behavior suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/4eue5rfcd8l46ov9ce3kb5qtu5/64990637201.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6608646d0fed1a248e58bac72b65be16/xodowuxuzim.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/35833963769.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a7c50d58---nunama.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ae6d622b9---lonekojo.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/vuluzomisigosivebomavabu.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/30178134155.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/8140839270.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/rovokega.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/tapaxokuxujavesisogaxaju.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/rabav.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/zupofiguxilorapivolemanek.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_160610_185.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160709bd47ae6f---86226996250.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210702_85ECD34A8BD93826.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/leligajufogaselo.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/17153520500.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa186614a2e---78679520464.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/16483677173.pdfIn PDF document text
    • https://melz-feu.ru/upload/10039129268.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/71625538992.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/46488388658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=should+you+workout+after+eatingPDF 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_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 10932 bytes
SHA-256: 3ab432b47911d5065c2b1f832f2cc9f0a5c46f0d0e8b1fa607be1954806eafa2
font_01_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 17852 bytes
SHA-256: c23df5643949da71bc36e23eca62f7c9ce23c07aa8796dfdbc69df489d002fda
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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