Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e234111c7bb28b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 04:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06b6e10d0ef8efdc9a53f3f7b2445269 SHA-1: 9b19965b60a17db251a74b6901a89f982a71f98f SHA-256: d5e234111c7bb28bb1e896e81cdaf726be8d9d48b606561fab83de4510882731
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute further malicious content or phish for information. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://recviem.ru/img/upload/15815592682.pdf In PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/sagug.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/63330990867.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zimifutaximiregobuxo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a551638f---68912306445.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798e34696e7---71966580051.pdfIn PDF document text
    • http://kag.fr/userfiles/file/83316674923.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0364e2af4c9bff893d82804a751fe071/japitoxisojat.pdfIn PDF document text
    • http://chapelguild.com/images/usr/kexewexanumafumukiwapexe.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/81070411288.pdfIn PDF document text
    • http://rld-carbon.ru/file/97118547470.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/44565927348.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///rikovutewo.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/2906822056.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16103c250bb917---nulewoluw.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/36214766232.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3f5f9aa3c8d3890c1bc4a91bd1786242/votibu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/68327264022.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/libemilerulimametefar.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/lepeziribakujafuso.pdfIn PDF document text
    • https://anjingliar.com/contents//files/jefezamaxerojizitu.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/24341427000.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606faea1b8a7f---doxolovorap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+splitter+online2pdfPDF 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_off0000b9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 17116 bytes
SHA-256: 9e57bef308f6036429eefb768b3b90fd6d72a2213eb87dda893d7c8e7c4d191d
font_02_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 10448 bytes
SHA-256: 48a09c7551405e25ed95d9901e6799b9c083e0beb91caec2f8e767be3994612a

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