Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ae2584a5fe54a0…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 20:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e7b73b3c58ff67c116f6bc1e724193dd SHA-1: 4d759e085b147ea3381f02ba177c0e12399b019a SHA-256: 23ae2584a5fe54a06045d5495efb82c13cadf5c188fa927c85648c1f02800464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://abwsalisbury.com/uploads/files/godezatabakab.pdf In PDF document text
    • http://strahovka66.ru/userfiles/file/20657926582.pdfIn PDF document text
    • http://nfc.soo.jp/file/41245177875.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/873925182.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611045620bded---37394276518.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/548ffdc8de6656d5e99d7bd6ff632d7e/79988912514.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/50226398941.pdfIn PDF document text
    • https://ivanamihic.com//files/mofokumolipanuzanet.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/rofekagumatufudure.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/hviko3messjhjqdvmvpb2fnmcl/mosugobarolorufadujuwi.pdfIn PDF document text
    • https://wecareprogram.org/images/file/91342090240.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/puxexigisefofigotunogagis.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/00a3a0792d6d6e8ca9c0dad02b83c25d/litojidememiv.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb8a32a56b06758a317b74cdbd9c16d/maguraxemixuwirovarezegon.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/kozodijavukep.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hok8lvg1kmt2ihur7k32c7bbp0/lodomekesuxuz.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/tonirodowokatusigub.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3358ad9974fd39075426bd24e6bd7d64/11715973360.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/puputotulikovowul.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/94013955828.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/jozugesaxusuwomelozo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/202d8dc7dc1db26c2ce3eecf26f98471/birizu.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/forivubezete.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202108260357064451.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7598730cb0e5a00a3c5f6e2d9e517879/10998808143.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/dedovigumikibogokovoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=libros+de+ortopedia+dental+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_off0000cba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 10588 bytes
SHA-256: e17adf23f316fff30712888672730d7e3f812925496884c586aff34d68ec5091
font_01_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 18844 bytes
SHA-256: 0a6a550d07a51c317855b9af5eebfb691f06f9f07d96bb39ab5f65bb431ff3a1
font_02_sfnt_off00011328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1