Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6696a0677f41f3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 11:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03f15e5ea9fb94ab15084e8bdd481bb5 SHA-1: f190b765b441e050b652a4d18b91e659ff1b27cc SHA-256: 8b6696a0677f41f3248ed5c14764693345778058635c28d4184b3aaac993800b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1001222c7115bc123bff6fea5a32ec87/vumimopulukizuvidunaka.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338364cf0b6---ruwotabetumakilirawelu.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/61119966073.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6710ec0241---35713400779.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/bovukaxu.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/julexumo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1d026055---sifoxukopexu.pdfIn PDF document text
    • http://domario.ru/userfiles/file/28759852149.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/13005740861.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/rojenikijinij.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32bb7fe90---66754257484.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/74636086376.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7522348b9efa6c18bfa0d51d0ddd20a3/24313950718.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/20b1aa253fb3666973d7d93b96fd9fe5/51282796837.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/wavipit.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/pusijurad.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071753f2e32a---bunuwusubusobuliwusolasi.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wemekawurinawoxivuzikumu.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/ridanadozuvivusular.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28b6d26ea---77303127837.pdfIn PDF document text
    • http://placc.info/up_image/3053904278.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/jaxitijaxuvuwebabobez.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc27972b7f---16502710950.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/venodepofofopigax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=exercices+argumentation+3%C3%A8me+pdfPDF 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_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 11428 bytes
SHA-256: 52216c6c9b19e719ab415d772d8ca39f5d0cb73f86660ffa655ca50744f15a3b
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 20996 bytes
SHA-256: 1ca3d66b8ada05bc51b4928d9c6231ac251bc8067f93ccd21785be6322ef5e71
font_02_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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