Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d5cbf31846f633…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 09:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf40704cdec5de16d379bf49865a84f7 SHA-1: 02ad04ffa72fe3696bde513530879ce3aaa16394 SHA-256: f5d5cbf31846f6334be285ac8456b72c00868f05ecec0f30f433f90afb07fdf9
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This suggests a phishing or malware distribution scheme where the initial PDF serves as a lure to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jmvlpslimited.com/ci/userfiles/files/46873803710.pdf In PDF document text
    • http://majorpropertygroup.com/userfiles/files/monudadipakugomutubesesa.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/182015479475.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rdkpd4hh7elvmom3rootum6dm2/39292283553.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/66132284726.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4031d55ed0a95fc7ae2c2aaace6dcfa8/somidibi.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/49831593121.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/kozujolanevatulutuwexinob.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/nagupeta.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3e6efce3889f32aac2ff56040642e157/34668184554.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/16024489090.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609835580509f---vabazarudirajesos.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9c921b541---65617812465.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/74724803762.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/95596243558.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/negevabiwod.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22da6b262---38649877162.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/kezezijusuwifaka.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210717_040027.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/xirulusudugedixewitu.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/betedem.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/82035896824.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/db186f5ced2abe16b4fe6d22cf0326c8/kakape.pdfIn PDF document text
    • https://europartner2.pl/uploads/20719987124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=viscous+damping+examplePDF 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_off0000c7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EE 10828 bytes
SHA-256: 43cc4a66c41f2ac585705eb038f827b0beb06c321229461e2de599afe0cf6734
font_01_sfnt_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 18392 bytes
SHA-256: b7fb897043d1f4fdfb3ee855f30e5cab7e6e9a0336edf85ff2f067f8e9f05309

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