Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93d5ec322581094…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 12:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8ecc36b9b05b2f131b521328373b4b1 SHA-1: 3d164981f57626c1eaf90cd543d3685f75bcb6f8 SHA-256: f93d5ec32258109441d9c4d37e22d87d736dd09ac60c8dc2e44029044ec713fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories or are part of link farms. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=gta+vice+city+cheats+for+android+mobile PDF link annotation
    • https://medgal.pl/admin/ckfinder/userfiles/files/wodaredimetozuzi.pdfIn PDF document text
    • http://guitarenko.fr/img/files/15333528441.pdfIn PDF document text
    • https://kermanrooz.com/img/files/93060156823.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/bixozowimuwagigu.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/nokutilodefewitotamom.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8qj24dp62q6omj85gasjtngh4n/betibokutuvepof.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wufavotib.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/21437797186.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/timopavifineranidimegop.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210905001616.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16131c8d73605c---wewafa.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/tolomikekaripejed.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa4e53fa6---dosusuvazole.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/84867329879.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/bawore.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/nezaguzusodetit.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd3574668---52414098057.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/64499067857.pdfIn PDF document text
    • http://maksimetall.ru/files/vikojidajoxiwe.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/4310432590.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/pevufodulenavovi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161389559beb7e---bafaworawewotolurun.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/nifabiwaz.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/xezinudas.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/zalibinutejuwaloxesuxem.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_off0000b87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 16364 bytes
SHA-256: 3c2fd550c4fbc148408d44510fa5ee8773ea94b0e70d85b282b640a0f597cc0e
font_02_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 11100 bytes
SHA-256: e662edc66e1ff52590892ce6851676f19551d0f4ed2235b35dddf15a2433b20e

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