Malicious PDF — malware analysis report

Static analysis result for SHA-256 481549863068eec8…

MALICIOUS

PDF

88.0 KB Created: 2021-08-14 16:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7db6ac144af59349b032b2c49d88c2fd SHA-1: b9d84c7402815e782d8a66fddd8ac4e1cde52cab SHA-256: 481549863068eec8c473a49999d2cb0ac751abe339963c5e6e211c2d18069b19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac76eec71---45592100939.pdf In PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1b1e61de---15070842636.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/xezuloluropamadomef.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c25e29534---58607905982.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/40650418851.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/didapugazezofasi.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/nojejevofu.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/81473635655.pdfIn PDF document text
    • http://keitbg.com/images/files/boluzaxepugetibajowape.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/i51jh7suqctlm78s507qu5q909/16184680794.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210726_9134A2AA97ED4A8F.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/dujipi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fd1a951ae---55888908619.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b30a0a6c99c---91964296255.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/60402357049.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/ehib1il3n0mnh9b1devlgmsep3/tuderoxulenogalapem.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/15262822188.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/20550456198.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7fc6ba04c---xoxikadepelananojuvolonil.pdfIn PDF document text
    • http://soc-in.com/data/media/files/tedoberipel.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091f614ba2e6---gugozusuvedexexove.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a0c1f8f2a1250b100882e8d750f9a7ed/9052551717.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2081519803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=unredeemed+roblox+gift+card+codes+2019+unusedPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/16671306001.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_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 11632 bytes
SHA-256: 5a263edcebb2857eeae0767654f9f28698a76f4d6f413975e53f9dd9f9f1bdc7
font_01_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 16764 bytes
SHA-256: c8d48ec9c49ab02f689235bbc6c11566cb6440ed76e5a5681653b5f228c4ff9a

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