Malicious PDF — malware analysis report

Static analysis result for SHA-256 457b699ec8354bd7…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 16:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 01c8def2c32fce4740b8594eb7cc9209 SHA-1: e8f91a7c9eed3892acec6495b8b5e618aa305579 SHA-256: 457b699ec8354bd776304a8bf8a99bbab0d1ef47f1135330d16b7fa523b60fd8
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by both a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF link farm heuristics and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://adabaskimerkezi.com/upload/file/kexuwelibipov.pdf In PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/7f4746bb20d0f04decbfc920c1251eb8/22902620913.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/804ku9bua0op9mlctbanccc4u5/65917177818.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/jotixek.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a0122e3e---ropixuxedorelot.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/fudogefemor.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/af1keohcihppf36ooa16maev8q/lunofub.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9r9lo8haed4vu8ulr9c7pqvv35/pisafazonokuzejijulemiwa.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/16782958147.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zizexekafax.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948ff529edc---zidizadiwubimeme.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4d044cf87491d3f7fa4a9413e42f67d7/76352001214.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e624d82c7480114750b76c66964c8b74/18182189641.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608070398784e---81265759760.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/fukinejodexomur.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/vejorobowo.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/e9e88c7b132a37c48beba2550c4f43e8/34623717466.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070beb74ff9c---lunebologajezenarud.pdfIn PDF document text
    • http://614move.com/clients/4890/File/gijotudubomerarerobaba.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tapevopovejenavokez.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b1b1bdad1---jepewexa.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/vejisixafumoxaz.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af534ec673---zirepibefukatuzer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tom+aldredge+into+the+woodsPDF 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_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10744 bytes
SHA-256: cfb9f64bfe4dc6a7ae63a71385577b708f78c51e72e451dc42200c90a4367545
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 17808 bytes
SHA-256: ab3917af5f3b70f34035177d4eabb839c6fabd5653c6f5f54d054e0155de03d8
font_02_sfnt_off00013781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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