Malicious PDF — malware analysis report

Static analysis result for SHA-256 797b0e136fdf7a4d…

MALICIOUS

PDF

90.7 KB Created: 2021-07-17 10:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eba849943ded8c3d1da13c32ba0002e5 SHA-1: df5b891a499a548be1aaa79d41e03a54a13fa4db SHA-256: 797b0e136fdf7a4de26f4940f915b78fdb7914fdeebe9af8aaf4c5a94bcc7ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/lc662mrrph7anoha6pic72lees/zoguliv.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba18ba099fa---kuzigoborasodipasegenib.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/6263922875.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/gorugepupiwovedituki.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/57827407134.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/garuniwoxoriv.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/lupaxomidolit.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e25a45049---907658401.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/89pfgr4fuo6vqs2j4gvepopdt7/toruvifa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b839ce42a---lekilinisuwesi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef13efe2c---lidaxew.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b317caf1447---fodunelew.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/52737466112.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa27a382ea9---64014821445.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/9adf61ba65865052029ddfc0b30cabb4/21240967510.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/86415ef69f6647a3a29ead6152144a13/beretegavomafinajad.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/70114424043.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4e9b46ea---nolesikufazirurimuradubi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/61039154506.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/36993571731.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/kuguberemeloki.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdefb202c5---39463980869.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/sikuzaxemejoxemepo.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/feruvosiguranipobegu.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/66204298252.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xalopibudebegujejevosibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=oh+lord+oh+lord+how+majestic+is+your+namePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 11092 bytes
SHA-256: 5e01e972914d7223eef51d26740efb93d7f33f99acf8cbbed20ae53b9d5f35cd
font_03_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 16848 bytes
SHA-256: a5bfc314908c2b7e1bb8a7346ae3b61bb8ab98e357c36a691b191850fee6023f
font_04_sfnt_off00014232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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