Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba95fc491a7d9668…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 08:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba7882dc22621ed388555c7145d4a257 SHA-1: 1fbe577fc31a8c2b421350177e54321f2bf9a4ec SHA-256: ba95fc491a7d966888a6a20ffc2ff098e2549335ecea22ec12db4c405d5f399e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many hosted on compromised WordPress sites, designed to redirect users to external URLs. These URLs are part of a link farm, likely intended to trick users into downloading further malicious content by impersonating job opportunities. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=high+paying+jobs+with+a+marketing+degree PDF link annotation
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c89c14a29---kevelebidofowavesedir.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/4318647178.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/lumutuv.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/71552914818.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/93944062702.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/9851727598.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/54560935240.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f145191c---83012307514.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/tigozadi.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/rekisizatodub.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/75206337369.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b290dcca5---66866514500.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/tezudenumubakabugasixin.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/b13u82em3247th92cn9osd2e97/57054334931.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5d356969---99597403527.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609823d9a9503---tamij.pdfIn PDF document text
    • http://abpaluso.com/upload/file/56898189886.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160af768f777d1---duzelorider.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wiwakowodewinararepuzixek.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c89af5db0d6---mawinadukapoxomifu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1008ee36f3353eaf0aaef896647a1d0d/rilavitogolugozog.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/fosisatusawimagomiwu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e505acdb58---dedizowekesupaxasegi.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_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 11344 bytes
SHA-256: a66675923aa586b531b94b360c8048551a2ca9c763ddec6810ed05eac0fd4bc0
font_01_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 17208 bytes
SHA-256: 926cf9217f6a92a4c27e7e24cfc906da16e287a80f380d5df4886582e14acb76

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