Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ba68ad2c5a2266…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 09:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f52df43e95d93a6a4b04b0a33901e76 SHA-1: 11fcacafba3a752936c2c40dce65a45b0834b7d2 SHA-256: c9ba68ad2c5a2266ea013d0f45d7995a3a237c426809a84b91c208179641f57f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the presence of external URIs strongly suggest it's used as a lure, likely for phishing or to download further payloads.

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 https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b3e9e85dbd49ba8528522b6e5414164/nupesadomalunanufomu.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130e66123549---vavixaranedowolom.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/49483212434.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/46597418020.pdfIn PDF document text
    • https://arendic.cl/files/25908440668.pdfIn PDF document text
    • https://stauber.lt/images/files/43865267363.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/96603504598.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/94537767289.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2b5c91b2---lowano.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/lilepubezixu.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/mafotuzit.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/pakemaja.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/31509060595.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wugurele.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/gixolaf.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4e826d3a---12423802364.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/541854110.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/nufezulavalelawabivejes.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/fobomawixixiwuvev.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/59011366086.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/98532021980.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/85712826277.pdfIn PDF document text
    • https://photofetimages.com/gawoduso.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/lofubud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mod+apk+editing+appPDF 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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 17980 bytes
SHA-256: 2697017b0e3415b01e6ff28a26a0a9dcad6c71789578a1f7a4cda50ca95a41bc
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 10336 bytes
SHA-256: 7686bbb356742173218709af11d066b6e4156c20b446714ba4bd704262214c89

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