Malicious PDF — malware analysis report

Static analysis result for SHA-256 e145523c54e4af9c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 15:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aecbbf215b0289824d0da1ba4097ba41 SHA-1: 7c1c2c94a8a8d88e8e49088417eef322c49df5a9 SHA-256: e145523c54e4af9c56ef82e31b24d904c7a62e8537f40e88231cd30f8f933633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristics and URLs clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://e-baze.lv/images/site/file/boxufutumesosaji.pdf In PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/18449881413.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/legebodari.pdfIn PDF document text
    • http://bjjiffy.com/upload/67878729118.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3f02a604f011a7d0d7676e70fe3f033b/35383280265.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9ok6pdaaqvlcl2se63sd63m10m/deserawotizisafajatopafuw.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/88191951166.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/84096771193.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/48692688562.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/54265345226.pdfIn PDF document text
    • https://computerzone.pk/file/majumutugolot.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613157778c043---dajuvixazegiv.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/dokaxonusap.pdfIn PDF document text
    • http://esteel.my/userfiles/file/83120529470.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/niwamijinipuvapibes.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/82557557865.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/63108061384.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/88003922243.pdfIn PDF document text
    • https://cargotavio.ru/files/file/2329497248.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/puramejafobiseg.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/75924103250.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/84442934877.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/19131471928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bicycle+fitting+near+mePDF link annotation
    • 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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 17160 bytes
SHA-256: 91eb9d85033bf421cbde18993539f624c2ddebf6f171ae9b6228a139cef1a4c0
font_02_sfnt_off00012ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 10556 bytes
SHA-256: 068462a1033a48ba3b33a8bc94548a4dcfdcd262c2a65cd3cbc74510b341eb46