Malicious PDF — malware analysis report

Static analysis result for SHA-256 65638653730b4d5b…

MALICIOUS

PDF

83.1 KB Created: 2021-08-09 00:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81d9fada00c2d74bc5a73492bf70bd23 SHA-1: 4be9cdda90cc62ca794404fbb35f642cb4583e94 SHA-256: 65638653730b4d5bc7921bfff931fd8e8e6ed007c8031dc8dd74401f0cd4a7e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8943

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/152b4c661abb0af7cffe17d5e96c1e2c/69789255549.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079fbe302f9c---77061600644.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/taragifaku.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609827cab748e---gadizutesebujumob.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e3e6a069537f49eb0c28c427d455fda3/zukinupevukupigetovubegit.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/17097517613.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9b3b449af6e8cee236f0268be2e79d2e/26628086207.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27f92b9586---28158486642.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/377fadfv0o99b5pqs2tp1bb3r4/31259380207.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f1f4ac61b7f23658907c8427d401e72d/92827962346.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/gamobetumux.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/tiridesimem.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/55862167654.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be32076767---89035196523.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/3055331947.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/198df2b51f7621d4f8d20efc07acd456/38015831158.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dfaa1a2e1---fusepuzegekef.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/81483606843.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db871034e2---sisoxofabo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f28aa0a01fc---93738438046.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bde534113617d1a657ed616483a213e6/fosukaribonafewuna.pdfIn PDF document text
    • http://vladekoservis.ru/files/morovatofederemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lyrics+blessed+be+your+name+tree63PDF link annotation
    • 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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 11184 bytes
SHA-256: 840c8ce2d295a52b47b554ea213f10ca0fd3fb5d45ff1c03d65883b904a9df8f
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 20224 bytes
SHA-256: 4ec4bef3139e466e5625673cd353346998fae37b0c84d9455f5a72697db2bd0d
font_02_sfnt_off000132bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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