Malicious PDF — malware analysis report

Static analysis result for SHA-256 010a0b74c1e0f472…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 09:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40a419b7bfacb3399841fd4c528e6e44 SHA-1: 56221b230be16931dad61a03fc2744d9e26f77a9 SHA-256: 010a0b74c1e0f4721c416b15c9a6348314caa9b8d94eb7bfc08485692bbf1e71
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://lev-steklo.ru/userfiles/file/30942745747.pdf In PDF document text
    • http://cooperclassof1970.com/clients/9656/File/87479636477.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/25083448775.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810391003d7---nivovesoxogozapuke.pdfIn PDF document text
    • https://zzhqhi.com/d/files/26045070869.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/18716586375.pdfIn PDF document text
    • https://www.casestilistas.es//ckfinder/userfiles/files/lorepapu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ff9cf1b0cdbfc18d5931dc856112c20b/95075188566.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/naponatinuxoxuripusi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7bffb5899bd433de7653bd51d7872c5a/fewip.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sugidewirawumosogafokejen.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/velivutez.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/nusejavur.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/aecfbf3bbeecdeeae18840cb6f5659de/95241037310.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/84632843602.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/75298841048.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073110a1afee---gexoxomaripuz.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ba0736fd---99604346617.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/vesujelevaninilimi.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/40166852305.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6cf4caa86---lonigodonoriwogek.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/51592254714.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/26973567290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hormonas+tiroideas+y+embarazo+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_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 10920 bytes
SHA-256: 585059afc85450e5c626a4703bdffa55f95bfa1ee3599cf2d87a33598c0ef9b4
font_01_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 18768 bytes
SHA-256: 62cb91b96116fc78f809e1e5453a6b33ca1f20029a8fcd9c3bb4ce5d2f6b65e5
font_02_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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