Malicious PDF — malware analysis report

Static analysis result for SHA-256 583e3a8676d24f1d…

MALICIOUS

PDF

73.9 KB Created: 2021-07-07 14:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec7e2a8d13fb302d84dd6876c5324013 SHA-1: dd6de82a87eb9a0e3257aa4b0a69a048dd2ac076 SHA-256: 583e3a8676d24f1d436198d74db2d87bfa06589bb44c9ff62bb6e8dd0a036aa0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ksuskalology.com/images/file/54305475505.pdf In PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6309252127.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/68882867961.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ou4s5g0p6ccpd5k4j5ucf2ufi8/80229405815.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4d4b316f25952d7134c451f3249a5060/35880560475.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/354a8bc03dd39ad06ca6d1861b75c862/70262613298.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/ganojas.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210707062945-mekuraluluven.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/59715375117.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3414e55fb6---12445291877.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/11042316071.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/vemusarubarulojedigu.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/24599200198.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/42heqki85u6kis5u7jis4gpqk3/95926731361.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/40048002505.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f8d18bd6---18908453480.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/10567530838.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b641ff69fb1a4385670024757de2dfb1/68714207842.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/6837515086.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/322ebcae05b2ca0acfa5c2ab0e043877/33544146754.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/xedif.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c177fed9---52640926796.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9raa2k13pptj1petee0nec7a7f/77640972589.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/sixixug.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716fefa27f2---fikutewubawogebonulovup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kenwood+th+d72a+manualPDF 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_off0000bd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5D 10500 bytes
SHA-256: 55f0b9cb88d8fbc9960d59e5dd0f252420034ff54f32236fa0f3ff74541442f0
font_01_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 17312 bytes
SHA-256: dc39284289b6954ef04ad8e9a56d49acd75954a9847562c10a7f49112f99f51a
font_02_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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