Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4e1d6a938eb230…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 06:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 92059e0559624e78d2421e767db94974 SHA-1: f2c147fb95e8614b840fae95729e34bb30ff057f SHA-256: 2c4e1d6a938eb230b17d50a3c591492cc9f1e3ee681ef9cd470ebe763a14b33a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/60876451584.pdf In PDF document text
    • https://sedefartphotography.com/resimler/files/guponaj.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/57345001297.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aac73815970---zibiwivawa.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/jigupazumudobifepufanom.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/98bbfdf1b48a9e3fa12ed8e6eaf53efd/diwevexenipovubabigelut.pdfIn PDF document text
    • https://capecoralliving.com/media/file/tididobagagavarekatiwag.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/pixasetifamuso.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/fijuj.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/44105467225.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/62559707878.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/rujewibegopa.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sqvjkdbk502eaqbuovpucrpbqv/lagit.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/906075010.pdfIn PDF document text
    • http://shophouse.info/images/files/sisunugusonujavawus.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/limerozixusufamupo.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fato2tjlsj005nmmu606nam552/xagenekokulubetop.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/59136628725.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zobamewomasuvukakaj.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/721d0220f1df237ca27dccae13f1e94d/61706417346.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/334256f8b23dde00d93686af797686cb/xobew.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16129efacd46bd---47308059947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lodger+agreement+pdf+downloadPDF 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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 17896 bytes
SHA-256: e1f1b5bc8ef2d33c4e2753a935f42a9d9210b3da27b24e456bddfd17a7c01911
font_01_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13721 10624 bytes
SHA-256: cc42df8bd44692bd15106870c36b916c6114558842e1b123a8eb5987271b7a26