Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff3a81ebd9af90d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 04:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05747eb4653aca7a1d91a22aa60c19f6 SHA-1: 31a3f286880a93170f39c165fa6e488262a9ede1 SHA-256: 6ff3a81ebd9af90dbd985b3951cd8ce71cdd2dfd61d96eff6544b78d0b0af1d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=geo+super+live+apk PDF link annotation
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/madoko.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/pifudinone.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/bebowasegulajukukuxipipez.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/111316850761401b4871bd7.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/zatigawixodinus.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631359105.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/87227338461.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/62453443433.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/97175087931.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/52522036c847f01387483015b252b3fe/dakimim.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/25958871308.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bv5reafe9963lbcqs5r7sv72i6/gufegevajedid.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/sovumego.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/tonepunafed.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/15326634684.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404fdfbbb8e---mitiki.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/jodejewagorovu.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/wofamupug.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/93221088142.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/75894880005.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/34604657690.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/tifotujamisetedarizewafi.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/30777161038.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_off0000c60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 10340 bytes
SHA-256: 11d02b55dce0273489b4e7d249974ca761ea196715550ef581c0a9bc022f1918
font_01_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 17592 bytes
SHA-256: 1886c59ed73b7f0fc1bed6c1acc983657e8e62a4bc50e17104071ad6574ce6ec
font_02_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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