Malicious PDF — malware analysis report

Static analysis result for SHA-256 283f35909e4813bb…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 06:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a82607425bd11050c606973fa522a27 SHA-1: 3d2ff7890c0bdbd87abcd7e7a4d72d1264a53699 SHA-256: 283f35909e4813bb1cbca7b1ca5e7c794e532d7ab98f4f4e107d1dbe2cc6c6fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96b1c4ead0---95451706554.pdf In PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/jitarunevelavegopubiseri.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8rn4nj5o02urokkgdct93eca5f/lamorilose.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f821deb621---kofodenirigubutag.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3e6ae64d---39504711036.pdfIn PDF document text
    • http://teraval.cz/res/file/wulizafigazolopimiwad.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/95636e637c65848db92205141682e42a/xitovegifova.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845e33f2e6b---mujikarawarelu.pdfIn PDF document text
    • http://builderall.info/userfiles/file/baxuxikixivaxemawokonar.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/noxumoterefewemumukirinug.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ifm3m18fsibqa956io4vr6te03/gedokeximon.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/59219542103.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/abd74d267400f97d22d505b2ce53194a/jupivuwedoli.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/47674403681.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/95clbo8ctph5i9lpl70055bqrg/76991411876.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acca64be14---40807369500.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/93c37f6e72ed0cc4b710db2b010cb342/mupiwigalirowedodug.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/7042268062.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/566457089bb87f6ae68b7bb8b918b630/wunepodopuzaxu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/bipunenutajerolinigu.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/wotigenotupadebiwoduvul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ejercicios+de+semejanza+y+trigonometria+4o+eso+resueltos+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_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 11428 bytes
SHA-256: b952d489553e9d9487ecba0035fcf86f52d0aac7de345feedca3626a799e4900
font_01_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 18960 bytes
SHA-256: b24f09cfd9c185c3b08dff28b03c8dc03f2fdebbc1dc4aa176f22f5898daf0a7
font_02_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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