Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dce5b8be81360a…

MALICIOUS

PDF

90.9 KB Created: 2021-07-14 04:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dd581e64e29023f79b7055835d96920 SHA-1: b27380232fb16d87462926a30626a10a6c17627e SHA-256: c4dce5b8be81360acbec5746991bef0e95bae3e89759568c9c2b7db229087654
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=full+body+routine+for+mass PDF link annotation
    • http://sendedianqi.com/upload_fck/file/2021-7-5/20210705212510596042.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1737c5007---81169518057.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/kagutotuzedubiko.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0553f78c00a5a344216b8c3db44e54e0/dofodadanajex.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f864e6532f2a3ffb7c01b176862b03bf/nuterojugotolul.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/sinugizabuwiwabukoxiwos.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/51991580770.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a2b6c3c1---paleverodumitem.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/tevijovorus.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/18177052004.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c2d47847b856894e0120159ca46c34fd/11111320531.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bee9b15b3---paxedekibusulego.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b58006b4aba31f4617106e4cc0b18ca3/11299619266.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/pifagirepa.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/72289855325.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/79afus0utg4fgci0jfsbub5kbh/98852643416.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/69163030241.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/296b46a63c1d66bef1363a4f2ec65d21/donobifi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/qp4kip7psgh6j7eqe6cnl0d0pm/19911408330.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/nogulezutokududadebeluzag.pdfIn PDF document text
    • http://gute-reise.ru/i/files/files/fovelexigamosagi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0acd7c24015e5e8c5c0f59d5dcf79641/bozogopovuvefe.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_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 10848 bytes
SHA-256: fd184cded1b69c1e6cd126195c6230fdb9d46766d6f6bba4ce84c21269a063f5
font_01_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 16456 bytes
SHA-256: 7f73eed66a37306bb3a1da8275109327c876eba18ab0d1d63dafca90f15fa92b

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