Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87f874dfe5681dd…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 08:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0022424404a4c07635de4aadbd127885 SHA-1: 6ca9e34caeae820bcb69ceb7ff2dbe6022e6413f SHA-256: f87f874dfe5681dd339a37173d751d929c404432da2649a881ad6d5a1d6b4350
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate attempts to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it may exploit PDF vulnerabilities or embed malicious JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c569754a5a---radupapujiparududonodewen.pdf In PDF document text
    • https://lordoptika.hu/files/files/60274227340.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/wexinusidaxoda.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/97538144952.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/kadokakofetijulemosogez.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134352d2c4b7---55048586127.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/14303210038.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/94124822871.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210918_D4141A896A909BCC.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/53735712247.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/riratukaluxudoze.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/59441128625.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/68892925983.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/81472863488.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/bovaru.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/96935534395.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/xutularukufovagonowirip.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132979c8b8bd---11636795807.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/78832862239.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/84203177999.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/kabetufubafokuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+live+stream+on+firestickPDF 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_off0000af5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5B 10732 bytes
SHA-256: 44d3f472b06d182444828891a6eaeab61d55b67b6c9f33a64788f457b2347f23
font_01_sfnt_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 15072 bytes
SHA-256: af5fb966f7b39a2a5718d6efd36187c156b4b41d82758269b06106f19ed23b4a
font_02_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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