Malicious PDF — malware analysis report

Static analysis result for SHA-256 1014974d84887608…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 17:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81cbedc1a41893bdf3b72b9a638d09ac SHA-1: f6a4d6c27c79c0a26a743698ebada82e36259a77 SHA-256: 1014974d84887608e15adbc4c4c29a03879fb5951a8b5ddb892a1888e8afea68
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm, including links to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://adwokaci-pila.pl/userfiles/file/24719026676.pdf In PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/satipiburibematopumove.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/zazugugife.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/pepowatonofijegubejelo.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/23201341850.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/manoxofumajaxoziwiruvuf.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecba16867---22668609474.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/60363823481.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-07-17-03-38-CuAVbsNy.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/87632596592.pdfIn PDF document text
    • https://epiphanych.com/images/file/favemalaxuta.pdfIn PDF document text
    • http://www.polni.si/Images/files/bemudeg.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/96991404851.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vegimiwebimekizogeka.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/vejojevujenobasu.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/vamerikitoxajamaxedodes.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee43e5510f---renogovikosuwawolub.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/l7cg9m0nvcb8uo0t4ff8snpqik/27107459766.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef47419d24---36792660116.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/panelukalido.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/mehsbs1ul857ugk0040rk993g6/taxadasenurud.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/79940229840.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/32758070807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tango+video+downloaderPDF 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_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 17660 bytes
SHA-256: 6df41edbf79964a10fee79d1fb61d379d46466b9b1c528484af9aad1d4961107
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10272 bytes
SHA-256: d9ee08a6691d663b5fef24e21b075f2189752ec1c773e56aefd6cf0060a33265
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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