Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24ec87795f695d0…

MALICIOUS

PDF

83.6 KB Created: 2021-08-25 06:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6aadf4d171142529d817c0cf1eece50f SHA-1: 60400757c8573571d1342b37e6674332181b151e SHA-256: d24ec87795f695d0b2e4f7d98c26dc7ce11577433a429c85346fe12fc203de15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous embedded URLs that point to various websites, many of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://medvor.ru/uplcv?utm_term=dual+coding+theory+in+the+classroom PDF link annotation
    • http://gtlitalia.com/userfiles/files/7558920760.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9fc2e3fa1f---87865077633.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5437fc8fb48148ac05cc7e8979a12488/16129398267.pdfIn PDF document text
    • https://faceless.me/userfiles/files/68978741363.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/wurewepefukorumurumaxezem.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/rulikizigilola.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7231271a0f---25174510104.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/33061970811.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/17151894272.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/22455602554.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7be6b9174e6b1d052e9e009c5d6488eb/rapuvejusakelasarikejit.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2986336b6---xekenanopikij.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sovefime.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c23af2708d6---razigokexivekex.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/68811200904.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/20476097744.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/jokitumorawejukebimomeba.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2e98325138c40a3991890d76e7723cfa/watuzoso.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/eba7a553145cf3a411fd7c8af17d1d45/20634349665.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kawuxarofabedetolerazam.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/wusuxefiwu.pdfIn PDF document text
    • http://sjhtractor.com/d/files/91924665467.pdfIn PDF document text
    • 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_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 16908 bytes
SHA-256: fdf78d5589a3ba118e9dfa25dc6d2acc3218bb6cce6822cd2b7aceb72007ef73
font_01_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 11032 bytes
SHA-256: 961c7716e8d35bbe206e2bdaeef6c70229da370e18da3a42cc4ee6bd95f643b8
font_02_sfnt_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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