Malicious PDF — malware analysis report

Static analysis result for SHA-256 759df0fe6e635bf6…

MALICIOUS

PDF

92.0 KB Created: 2021-07-20 12:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5acd024fff65433d7e64e52636c2bb49 SHA-1: bd6707723868d4860670f18bd5d6b1bdb28b8566 SHA-256: 759df0fe6e635bf61e1594f71004696059412fb88904868cc6222ff2fc438273
164 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a download button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed51dbb4844---42286483489.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c49d8fcd---86472983232.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31f3c68dc---32380646061.pdf
    • https://kawanmto.net/contents//files/lunijelirakunugaki.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/n5i0olkvmp9jqt6ov0b2hi3fnd/wakavaxisisemukamu.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16070f329ac470---vipesupurekal.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabcce768c---76848819626.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865ef3a7822---redafaroweropusorijupatot.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6deb366573ffa8ec43cb012092c8891f/18322129240.pdf
    • http://www.amedna.com/userfiles/files/12421867455.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/72241601556.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b5d8020a81a1002541889d8ea82d7c35/16950210643.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93f791b5f0---rizuzowodavupuxobadufod.pdf
    • http://marathon-gexin.com/Uploadfiles/files/21843298549.pdf
    • http://eska-lift.ru/userfiles/file/nizezufuxibujirewufifeji.pdf
    • http://ssanadia.in/userfiles/file/dadezi.pdf
    • https://mm-podium.ro/userfiles/file/zibusepiligidotut.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea647c743d---63675177321.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940e51b5dc5---19116717286.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6d9df99d137cd80595ca196e1935503d/setewenelukukimizakokej.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c5409739---24211593404.pdf
    • http://safires.cz/ckfinder/userfiles/files/99971327317.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160831641ca395---xezed.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=captain+jack+sparrow+full+movie+in+tamil+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012dbe.bin
be26937690f6461a165847a772042ddf3e7c2187b485c561945e89bc2cc28987		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12DBE 18168 bytes
font_00_sfnt_off0000e46b.bin
de004fb0dbbefeb4a85e65add5d74dd385649123d7a77912197f94d3af22b137		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 11288 bytes
font_01_sfnt_off0000fefe.bin
eb53df473f53e9a4324acafe1c889e372949271fe4e4515286dc1a5a8b111ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 17784 bytes
font_03_sfnt_off00014a1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1F 16792 bytes

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