Malicious PDF — malware analysis report

Static analysis result for SHA-256 675d1dca0d5e2623…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 08:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 987e266efa451af69497418e4ec1e3c6 SHA-1: cd0eff12c2c186e2540640aa24ac18ea07439990 SHA-256: 675d1dca0d5e2623e738f03fe69297901675850722f67a7848af58cdbc06f941
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage SEO and compromised infrastructure for hosting malicious content. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=how+to+see+who+has+searched+you+on+instagram PDF link annotation
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rnjmqc5qhhedfmuhcd8k2ct6la/zoropelinolato.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613a23b5b1b33---bokuporuloxibanoro.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/waximufeza.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4e61d13f---jovapemogunutofali.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/jojixusaxigigix.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c52d2988f3ddaf34ae2aacc651e1429c/89437541193.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/damoxemenidupamizorod.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/29969962037.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/38374206752.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d8ec39710cfa09afa4cd7c7eae22b499/getugiwufajezujizelup.pdfIn PDF document text
    • https://pecintajp.com/contents/files/dedidavafukom.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613485f0826a6---98999706420.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/wazuzusavasabowufuxuratoj.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/70823342602.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161311e8bd6ea4---52555352778.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/gebisisuzuzotez.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/9054387149.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c4187bf0---97787530576.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/e03979b2a82d02b0c4b1071cff15e2be/53538771396.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/fesokonusotuvura.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_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 17460 bytes
SHA-256: 719db5e5fda0a1c49bffc746da1637004bb4ca610297806767c6f0bdc135ee39
font_01_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 11060 bytes
SHA-256: 0ffbef55ad316bbe2939ab6202a3d5e3571efa64bd650991ba9448c3e7d712af

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