Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de36b783ae33fc8…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 06:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df58ce15cc74693685fbd99bad20bb03 SHA-1: d278f53045caf392a8dec99a5b0a1f92d77399b8 SHA-256: 2de36b783ae33fc80c30b1b15f2c1b9676cc5c2aa5eb4d50a2d1ac0056132b7b
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to lead users to malicious sites. ClamAV and ML classifiers strongly indicate a phishing or trojan payload. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/90099234987.pdf In PDF document text
    • http://geometracosentino.com/userfiles/files/zowuruzal.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210713162619575364.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/49400792746.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/taweka.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9afbe2dd7---2325958549.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210826011003405091.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/92479459784.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/b1ef9pk924ob9sm1omre9kmp9b/pewofufobogudufalupix.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kirado.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/98720488289.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/71403713109.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160941787e8a40---dojavubufagoweku.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/sekolugodisirubezos.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/32037438221.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/xafalibemi.pdfIn PDF document text
    • http://gibeaufamily.com/clients/870383/File/69994379594.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986778a905d---19894679372.pdfIn PDF document text
    • http://safetypath.net/cms_images/52134768144.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/febojaniseral.pdfIn PDF document text
    • http://classtool.info/upload/files/99095577289.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/93101828557.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfe8a3bd82---98865650718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gullah+language+pdfPDF 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_off0000c4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BA 10336 bytes
SHA-256: 3c61bc11a23acfc0b3143ad16b4bef5fe30f163d284b53b402bd8e9405cd8053
font_01_sfnt_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 17668 bytes
SHA-256: f75ba62400f7ecf3d6f8e2b40316ac54dbf75dae819942e20c0df7c49cd77fc7