Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e21de97dcf644a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 23:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d0e5ca34cf1623fbe2ede95cd2f9762 SHA-1: f4e26698892f4c42eaf33dd31486615d3615e068 SHA-256: e2e21de97dcf644ab621d67408db65874a82d34f9faaad327f15af48a2c906ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of link farm heuristics suggests an attempt to leverage SEO or distribute malicious content through a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://matchonusa.com/uploads/files/ganudota.pdf In PDF document text
    • http://superazs.ru/images/news/file/42386900245.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/47704263500.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/69db480f493eda26a77c949039f74222/21765127597.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109041116139413.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613583f599f87---timizeke.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/subesewuw.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/41174621172.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210911135638.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/81346632462.pdfIn PDF document text
    • http://wernitznigg.at/files/47712541523.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/sarubasutazot.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/zivafoxikaxuvuzemelewuvis.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/61363454262.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/lojurote.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89048461652.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613090306c0b9---bizuwokurunati.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632092042.pdfIn PDF document text
    • http://balalajka.nu/media/79020543916.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/4410549932.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/voforuj.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/vesidudunefowo.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/32211427480.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1fabb4eb12dd9af2dcee4fe79fe3fdc6/22649419784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ludo+king+mod+apk+download+latest+versionPDF 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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 11036 bytes
SHA-256: eacff87e67f6b3ac31df151f9777a8a57dc43d131a6863d35d8d4f82d80aed31
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 17496 bytes
SHA-256: 0362935ec34cf24d5637de1314c7f2b290abec0080a5c026d3bc6e2b07beb07a
font_02_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1