Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2864fb6f61e925…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 21:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2abbd9947661bee52f742366fb3e46eb SHA-1: 57cce9a1e28fb03ae8fa24255664238822be1115 SHA-256: 2c2864fb6f61e925d54f9bb308ac00ebff73f21c82496fc233e134ed4bfeaa57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=can+you+add+music+to+google+slides PDF link annotation
    • http://ccsctda.com/ckfinder/userfiles/files/20210922_141525.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/lasiset.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109170015035054.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/wafawazasi.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/93145100800.pdfIn PDF document text
    • http://michigan.easydefensivedriving.net/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/gorokamarubolepikupikeb.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210924015128311.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/xoxevan.pdfIn PDF document text
    • http://corkpotters.com/images/sanojuvenuwekoseburinuf.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/51177476492.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/84854400646.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615311ec5823c---pikofixuja.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9e6526d6ba4e013d09164325f2bb4b98/64810147504.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/xewuturetut.pdfIn PDF document text
    • http://xfswchem.com/upload/files/58407905557.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/11656084438.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/66626867938.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/52332457946.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/70866275854.pdfIn PDF document text
    • https://aedwea.com/upload/foto/dejigubepujepekubuzora.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/fopewetaz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kjkaphdm38nrderdncqr8u56u1/79058434416.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/35349089354.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/92940687926.pdfIn PDF document text
    • https://ms1oke.com/contents/files/82735105139.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_off0000b579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 10856 bytes
SHA-256: 61201fd3d164eb2a9f20467372e487765e11ccb1719a8efa71ff942f1abd7f66
font_02_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 16124 bytes
SHA-256: 1d780e4ff8e1199f8485c326856cf9e5ea240446f55b8d0fa7fe811d2e16dff5