Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8d7db939de3bef…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 15:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35ea307ec8c0d3f9e8751930ef6883a4 SHA-1: 9cf1be6280819bbf72e4f2bb306be15c8a3ebde7 SHA-256: dd8d7db939de3befc5f7b6d07a1147c55880158167e346122fcc02f48e83c568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised or potentially malicious websites. The presence of multiple external URIs and a compromised CMS upload link suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/22758960585.pdf In PDF document text
    • http://studioarclab.eu/userfiles/files/27557880663.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/52120811611.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/lovoxawif.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/onnujmhgjhh7j2c0tovv9fju9a/20182680772.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/538cca24f25ad74c4e21b9d39369beff/gaperizedukoro.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/kukopeti.pdfIn PDF document text
    • https://tigaintan.com/contents/files/buxofitixe.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/98750876533.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/17966882881.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxomupasuniregofofolixo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6962c52---76829750989.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/zigojiduwigezubomej.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/majezusuxukepubilujinufa.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/93443075966.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/sojazolubijunum.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/rewibubebazevivi.pdfIn PDF document text
    • https://www.poeles-granules-vasconha.fr/ckfinder/userfiles/files/dinovuwusamokipiz.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161494e144aa7f---52283940992.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/bopalavikokivexe.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/vawoxovizi.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/dawipefijuv.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/finonepatozunu.pdfIn PDF document text
    • https://majubesar.com/contents/files/difabil.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/lasotikuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=online+movie+bollywood+downloadPDF 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_off0000b1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DF 14648 bytes
SHA-256: f14ef9d122a6fe4bda0c4f245244b09e31f6d61582d3a43f40d21765515e1879
font_01_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 10472 bytes
SHA-256: 245aa4599817a27428d0c552a978a19fb8b30098d78dbf003d677f40d0f45cc9
font_02_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1