Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb63a28cdb62328b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 01:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 380f3b415064fb7e3082c17df5684ed9 SHA-1: 35f31a20318560eca8595c7c6b09f43b9b76d78e SHA-256: fb63a28cdb62328be3e3f6376ff9348624b2773d752e7ce47d76111637cc9b73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, likely intended to lure users to malicious sites. While no scripts were extracted, the presence of multiple external URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alexhoffordphotography.com/temp/files/file/zubogewo.pdf In PDF document text
    • https://xn--nmqu14inmf.com/upload/files/81103501313.pdfIn PDF document text
    • http://kfbi.ru/content/file/34241966804.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ca361978adeeea45ff8c7377972ef31d/vevusagaremisamifekujogab.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/15459379529.pdfIn PDF document text
    • http://movediary.com/userfiles/file/sijojuke.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/6872894390.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be84c5ec9bd---xivekezitu.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/tuseleni.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae69a4a77---50827438804.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/guleputano.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f288bb79b5b---wedutakuwuxozoremu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073b231a36f8---40201338399.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ff79779f9ce---16763729395.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/34930069570.pdfIn PDF document text
    • http://blatt-gruen.ch/files/17021181507.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/9887019199.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/mejeg.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tigojuzamovu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/469f22b319545775613710ad9c9be875/20320159539.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/81542959549.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/78412404849.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210620162257162489s8sgpt.pdfIn PDF document text
    • http://rnralpha.cz/res/file/sesunemenaxelutogososuga.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076b55d393c2---vobukipiximazapaxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gerard+meszaros+xunit+test+patterns+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_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 19584 bytes
SHA-256: 921d36a6c001fb76a0d3d25dfca5731463672d27b69c2dbe539ec5105af656a7
font_02_sfnt_off0001298c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 10916 bytes
SHA-256: 2567b16439e2ec2c785721c360d987f150abcb2b1ed20baf1f48c8f36161e8d1

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