Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c116277bde209f…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 18:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bfa51381ef92867580417daec3f164e3 SHA-1: aee2ae0245a9258798175856cd74b0e323882d49 SHA-256: a7c116277bde209f85ac3f7f52a4e87df190e5d0314c6098ddbfd60dcce7a978
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs that form a link farm, pointing to compromised websites and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=leica+gps+system+500+manual PDF link annotation
    • http://factory-01.com/js/upload/files/55110050902.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b675a53c53---fepatezudugop.pdfIn PDF document text
    • http://htapigroup3.com/contents/files/rumon.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaf3a9e306---71478641173.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/relilobas.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/nawapunenabili.pdfIn PDF document text
    • http://rld-carbon.com/file/bizobosizapiludedanejak.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wekovojawolabudedib.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151377e77a17---98142310991.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/betotuw.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153ac4a6d325---ketebiwa.pdfIn PDF document text
    • http://myslizdrave.com/soubory/ridot.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161459b6ad8900---71003711898.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/tonugekorunipi.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109301644107881.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/49756409338.pdfIn PDF document text
    • https://ksboutlet.com/file/files/5208106584.pdfIn PDF document text
    • http://prota.ru/upload/files/57463451843.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/96655828357.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/nozavoridizanumiwusuji.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/28304391033.pdfIn PDF document text
    • 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_off0000afe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE7 14880 bytes
SHA-256: b34ec2967e0e36f896e9ca494ef92313528f5ed7f167c4c710342226315e6890
font_01_sfnt_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 10924 bytes
SHA-256: c4708f34b546e081b03e2638eabe5e59fdfa255c8fed8235ca330f9a7db8691c
font_02_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1