Malicious PDF — malware analysis report

Static analysis result for SHA-256 73edd8363b41f036…

MALICIOUS

PDF

81.3 KB Created: 2021-07-13 23:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 94c5981b326825223c264e01203ffeda SHA-1: 35fad0a0ea0fa40bf16facd4cc2a8b38c73571c0 SHA-256: 73edd8363b41f03655843da3e6f51d98d5c21a9aae9aa5c2c4f228d4efaf5895
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/66ded5c2af95235ab1037d2de3bd4f54/bunesawomunok.pdf In PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f2daed8bd4c6e7740aad00079dcf97f5/fenujud.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f8709f59ac44bcda9c3f1643a1908bcb/popevasinajafuxipafosuki.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/77d4717a3fa9a39c0e36e2878709a061/64772440599.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nunutubuxogaz.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160720ef2dad56---14973981536.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/27008284266.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aabb3ddfdb---17267948422.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/tajiletitarelizate.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pgqgs72a1k3obp5i8o9vepootc/kanidufor.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/3513d25f033f0cc60fb35d79d62dc025/likiwerewotirazoge.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/17606317783.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956f8d9ca60---95834736755.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/26537248053.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/55495997558a520053dfdd9c48b17073/norinurodoro.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16071254ce3727---68440782347.pdfIn PDF document text
    • https://businesslife.com/content/file/navep.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/jimedarewubobetewafexe.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc96f1852af---sajisafaberisu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da625d87af8---93107543097.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d32e9d50e7---kobupeg.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c37b6e6d5---lawirijopunutuvemajob.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbad9abd6d---48320527709.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5066ce990---30985349314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=you+raise+me+up+hymnPDF 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_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 17708 bytes
SHA-256: 7d4fa14fda0bc0be4f13de7065fd4b09d4d17d5f6557ab9b8837ce0f3f4149da
font_01_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 10568 bytes
SHA-256: 5403f98a9dd1b3192a8457b8332681dd0158985901d40b45f23c357f71d1ccf0
font_02_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1