Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bda2bcaf665a515…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 18:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 946f50abbb5f86b7ca2fb0f1a5005868 SHA-1: 02e82e71c6c0f02ec6fbb88c0193a082b5cc8a6d SHA-256: 9bda2bcaf665a51577682115ff32651253177366137e8e9fbe20c92077cd097a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs and PDF link farm heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. The document body is unreadable, but the presence of numerous external links points to a redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://catamma.ru/uplcv?utm_term=speed+read+app+android PDF link annotation
    • https://jyapa.com/jhuoyue/uploadfiles/45122259186.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/motosegevojebu.pdfIn PDF document text
    • http://iccarrentals.com/files/file/sagabekunufulo.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/3376265597.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/93952597641.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/4511902887.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/21325955793.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///samefubobexosekefapemoso.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/85227794460.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/miwarabefafogilomopira.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/matipenemevagili.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/28276992520.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/52f5f05b5561c2ec13504996ba2428ad/baritevudevigufun.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/sevavovobatefazifuromus.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/xutifufunomenin.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4hm16otkl0pkramosef4b02vtr/nodalaxu.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/pavavowivomodidisekato.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/refusasafopepiwidinudiw.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/livokuxeridex.pdfIn PDF document text
    • http://373113.linker.tw/files/funaladukene.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/62024353926.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/jepudagufidorazaropar.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/zolinevatumuwanil.pdfIn PDF document text
    • https://websbag.com/uploads/files/1896521931.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/77852035726.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b60788f64---guzawovabiwafufojitoled.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/121529192387.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_off0000b225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB225 15092 bytes
SHA-256: f753a9c1d0e3b3d499aadbfce36393972a297decf844e287440f73c6f09e54a2
font_01_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 10148 bytes
SHA-256: a816f38b17282313aa21bd7c2021e2622949537183a8a54cd5e6c6af6166508a

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