Malicious PDF — malware analysis report

Static analysis result for SHA-256 576fdcf68958704e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 13:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a9209ceed63c2555a3a11f67a1c3afa SHA-1: c758c9fd8279a669fcf0c0fdb19a1dd1d8eab500 SHA-256: 576fdcf68958704e24d9d52f755a4ccd04db8d6fc16a424281d60e207a4b3289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. Heuristics indicate it's a link farm on disposable hosting and points to compromised CMS uploads. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of external URIs and the link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://timnhanhonline.net/upload/files/xupetoxovoxufiropowu.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/kasavom.pdfIn PDF document text
    • http://zl369.net/userfiles/file/40934446401.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/folebonumu.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/91366524734.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/90618314150.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/xejigipufisizegaw.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/011006232112.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130700569ddf---31882912405.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/37843199778.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613132a856ef8---vuvodazipixejoweg.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/bagaramagapodavonurugu.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/veworufepimogu.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/98318630792.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/436f756611878ee540baa554e5c8d70c/53110602960.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/66182090731.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/43828413373.pdfIn PDF document text
    • http://vhktn.at/images/content/files/bixelex.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/95188409226.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/jamibogasukas.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613633a858964---41285795176.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/vozekovepikeniketu.pdfIn PDF document text
    • https://aneri12.eu/res/file/82843900329.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/22945573655.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/54530896578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fw+redmi+note+8PDF 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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10304 bytes
SHA-256: 3c2ca16d16c960337819e381020fbbafc762872b242b1c67dad43d455f07d83b
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 19248 bytes
SHA-256: 4747f22169398a246bd2c6a3fed2605c698d6cc60cccc35e5e9f26f995b3c78a
font_02_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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