Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd6c1bc9b5916c9…

MALICIOUS

PDF

83.6 KB Created: 2021-07-15 15:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dd7180a99151e0e19816f3d6baf56b6d SHA-1: 8625d04302714aa851c710f58a5cb6d643ee187b SHA-256: 2bd6c1bc9b5916c95211c2781dd7599b79c7dc4d11fe64df2bad4550568067dd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lensprovn.com/ckfinder/userfiles/files/2264182669.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f8d8cf69f---28568759160.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080998dabb6f---23389044451.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5876074ca4854c091c53119774dc370d/5614270205.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/43764332883.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb93f7ab3b---99434609897.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/14172797344.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/62529988324.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/45157875139.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/7696715212.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/gekugodowebawometekiloz.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/16676967688.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609849a48a562---77556488772.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/mapibatidemetolodegar.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uik1l12kmhnq5889a5jqjvpoto/8813735632.pdfIn PDF document text
    • https://drsaman.com/files/wodimuminefupuwim.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e867b36c871---duxodujon.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed4986701---rumubopifidajerasedako.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffb15d649---rejosopomematubedabipeji.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/vuruwabarubazofodoj.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/80243585307.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///50949742781.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/58348180996.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a321e1b803d---norosipemepira.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/xexevitoxatesovugoxebumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+fortify+smithing+potionPDF 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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 11040 bytes
SHA-256: 95a0f2399e63cc3738c69fceabef2390dd93aa458a6560c3dece06ae280c87e6
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 16212 bytes
SHA-256: 1b47084f3369eb00ab75f079515120e74d114d48f931b905857b925a8eacf59a