Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35134c63532dbd3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 08:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77f11de9ee3672e11ea361475b8e2e66 SHA-1: f35f47295b895fd9221022897012c4aff8aefe44 SHA-256: a35134c63532dbd3707d4da99c4839f42b116c10bef73e7b8e60e2709a84e2ce
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of 'invoice' or 'payment' language further supports a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nhakhoasaigonkimcuong.com/uploads/images/files/rufal.pdf In PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/81070589597.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/sajap.pdfIn PDF document text
    • http://abnicum.ru/files/file/jaminaduje.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/10025997842.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/kusuwegotutulagewajafok.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/xitodu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d1514459f7c01c0837769a6fcb226c76/3199106517.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/wukururubodudegixelivamot.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/56317855573.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/nizavowop.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbdae5521b---90261916170.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/11353649486.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/xuxugapovofat.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/jodizedutisirarav.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210907115314.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8acc1b1f1---81532651615.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/tuzinowaseminotetim.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/xapivuxutekaluwexibabuvud.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/debunoximatogebupela.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/zaxemorezeguparib.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/fatowaja.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/33476110950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=iphone+xr+256gb+price+in+bangladeshPDF 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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 11308 bytes
SHA-256: 9feb9591b698fd3f2f59e78529818cb0b067d3a122b753a42176c0a30469a1c9
font_02_sfnt_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 18908 bytes
SHA-256: 6354bdfd07db72a4ef72db7aa97493b1a337ffcb0cfb92a8281a17e5e68659ac

Open this report in the interactive analyzer, or submit your own file for analysis.