Malicious PDF — malware analysis report

Static analysis result for SHA-256 b676b4d160479f45…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 10:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e16af260300b5d1fdf598c61115aaaf6 SHA-1: 1145291d8a958831a6fe58aba1dc4d2ff082144a SHA-256: b676b4d160479f45a9023ccf5e5aa919c9568200fd7d178dff0b77bd02b911db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the nature of the link farm and the detection as a phishing/trojan suggests it likely serves as a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=cover+excel+to+pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/00dea9616ed1bff4325417f4e1f43d94/fibabinigafi.pdf
    • https://tdfstore.it/file/72415992646.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/dd54804dcfceeb80aa5128448e0173c4/51979888127.pdf
    • https://arrayamed.com/userfiles/file/71329113059.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/51d25f48b54f27ef54bc7500f995833e/zajaguf.pdf
    • http://vds-construct.pl/userfiles/file/717467341.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/kl54tfs31nv22j8lt1qn9vdkof/78814208905.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/87f0f75168c813164922bcc957b77baf/fixodoj.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ec131ab8af0d9d0e7589dfa7321a9766/86817222485.pdf
    • https://euroroma-bg.org/files/file/58400948968.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d62df35aeac---39028032475.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2299179fc---12724165667.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d22ba7e8af---fipopuz.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/v9k8phfilc1p3tnstsu707v8f7/13176742100.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837efa0df8---67371112636.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m9qmk0dhs1qcln3eu68inm1304/rotunapijonipo.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8aa7c34ec---naxebeputewezonaf.pdf
    • http://mrmax.ca/clients/9797/File/93444706708.pdf
    • http://gramercygrand.ru/files/file/13140061706.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609097406a7ae---67089424510.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dd19d70ba---87069833857.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa8e3ce8e---23409450205.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9crq53uga669d1pn2r45tisoj7/54915571311.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18583fc34---81719581343.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa67.bin
aff7a635c360ae3a1adbcaaff5342331eff118dd801be1b2a322f49ce124415e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 10288 bytes
font_01_sfnt_off000111ba.bin
2513f064b8d04b46a948f7bd7ce16d4a63a4ca53efea451e94d2263a3d349c46
pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 17072 bytes
font_02_sfnt_off00013e5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5D 16792 bytes