Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea75e58a134ac498…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 02:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cd4d94208e28f6c139478b10df26d28 SHA-1: a07a26d62cfac90b5afa0d52d0b577ea448c23fd SHA-256: ea75e58a134ac49895334ccafdee9a3e29fd65a3243cc5a18edcbfe0528610cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

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://pistant.ru/uplcv?utm_term=ebook+statistik+pendidikan+pdf PDF link annotation
    • http://birnagarcollege.in/userfiles/file/xovebisedorelawik.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd81ce8ad61---46007025955.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/38651bdab8fed37a1b1cfaa9d5e2de3f/xotapizajito.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/dezegajomi.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/gotesapobasadaxavuxofowe.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/15219015007.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5f5b158defead0ce859e02872451bacc/wetiseri.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/61442020364.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/63513515553.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/99342524977.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/35294288416.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/xebaxesorodunujefonibov.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/fimonovofunufepimifamivos.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210714094552_1589301696.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/gunikexezix.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/83502195846.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e9b4f1f53e---doluvevuj.pdfIn PDF document text
    • https://biocoils.com/img/file/10425855976.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hsgnudb7i4h0148ijp8qti5thq/voponunufodijexeru.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/goredijizewulesanujas.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/84247654740.pdfIn PDF document text
    • http://elitvorota.ru/f/file/kijeniwigatumexozifo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3dae13dd---18667615980.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/29a256472fb7cd9e3281f04280c4a10c/89079425958.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070571a0db91---16443993561.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_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 16056 bytes
SHA-256: 20ea63c534404ef424344e46460e8cb8a918b26e7ab72dad40209df47cf84373
font_01_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 10560 bytes
SHA-256: 1b24d73c10b17320b94d6af23614685b8c8e963565094fa609cfcd657d471731
font_02_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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