Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5457fa235021762…

MALICIOUS

PDF

121.8 KB Created: 2021-09-04 09:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dd31d6cb2380585b3c5c5161305f608 SHA-1: 36afb33d6941b89cd1d1de1b9c682fa3719b0f75 SHA-256: b5457fa23502176264fc6a5c47e5d7370fcd40bed36fa284a60afc219e9d7051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3817a0b874---lagovatu.pdf In PDF document text
    • http://dsagco.com/Upload/file/pimalijutawasuludapefovap.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3aecc2240---pirosideraxefag.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/lujigipifuwebuxutemo.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/vemumixa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lq1qiv64lptdgtge17ve4k0373/79447674439.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/96891798914.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/60837928506.pdfIn PDF document text
    • http://espokebar.com/uploads/files/28220636647.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/kavexubixetu.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f52aee980a51dcc6b6c678d760617174/namixitivak.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210720133416193.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc201f957---bawididaxotusimenumibab.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a6d387f009d282aea2eafaa8763b342f/83006605897.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dcbca5b6628573eeb15c5a8d98ec55b4/146452747.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/wigixoxug.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c08212ced0---lalapugixezajegad.pdfIn PDF document text
    • https://mfdesign.hu/files/file/88997755195.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/zepirawedekida.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608782d3a20c2---xojurarezutubemarivov.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5eb2c30e3---tupizenojiloxajatukewa.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f461ea921c65b1de9997fb98cf37c8ab/40180252271.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2333744ed1d52eb0cfdf311ea1c419cf/59097621144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=triturador+de+alimentos+manualPDF 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_off00017450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17450 10472 bytes
SHA-256: f7c1c44f5ab04d56f5017e5bb032efcbdb29d304f5536145c9735071b6b535be
font_01_sfnt_off00018c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C09 21412 bytes
SHA-256: d9b6c13be2e8e8a7e2a0636729547cc97f9a1e3e840045275902d084fa73819c
font_02_sfnt_off0001c16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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