Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc560c1ec7c527ee…

MALICIOUS

PDF

80.7 KB Created: 2021-08-12 17:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c27b85b79eddd1ac3c8cc1a23c846e9c SHA-1: 79a647f895059e0a850d07086961b815f75f9e73 SHA-256: dc560c1ec7c527ee8043cb66c4fc0fc9a35597b959357f12f2b515ebcd0145bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=plantronics+c054+not+charging PDF link annotation
    • https://hanurichurch.org/ckfinder/userfiles/files/veseduwamafenude.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b520bb0b---70623736718.pdfIn PDF document text
    • http://orderkai.com/uploads/files/34384209739.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0f9316ab97cc6cb041e5163bcd2a2698/fikiwawakozikiza.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0bc1719c42f44e92ba97417e87f123cd/jijipokofinopinuno.pdfIn PDF document text
    • http://asid.rw/userfiles/file/fokewozuwilumede.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/45e58bea1827f952047c4143ad537004/tarikejedokerab.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ecqo2u6aas3uu8gnbel7dircv2/xifijowevafepupovab.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108120835217922.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dif80msldfu5bcimbq3p4bdne6/18797100187.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/99b5f6ca91b8c1aae560baf43e2fb1e0/56296261106.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/kojafalazofavukodifewarig.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd355f2df---roveg.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/87628398603.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/puwasakidetubosesok.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607277bdd60fe---29421636401.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/murivetejo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a1bc56ecf---6633385213.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ng6c34q8mchu6au3j5soo0pr9j/tuzotobi.pdfIn PDF document text
    • https://brickzoo.it/file/15005317125.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/62470249179.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/wipisoles.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098709575057---28429792518.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/gepanov.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc53866c9---66875948442.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79d24efe3---busikidelejanapikedo.pdfIn PDF document text
    • 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_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 17628 bytes
SHA-256: 7bf4fe0bbb13d90c5cfbbffced08282918a90037035423c797736b8e7210c88f
font_01_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 10712 bytes
SHA-256: b1fdf41720118ca3ec7fbbc26bd267e3a9973aef719cea0d9825e6888b55276e