Malicious PDF — malware analysis report

Static analysis result for SHA-256 5249f9455357dba6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 09:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94a1b4f15a0c46ac4602d2810513626a SHA-1: 696bf9f64b36ddd386f6ac145fdccbeb5299f822 SHA-256: 5249f9455357dba66ebfb0e1d23ececaf626a022e9ebe6012bb361bb5535ea51
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 compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links suggests a pattern of distributing malicious content through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ffc0f7decf---99826874974.pdf In PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/87353827998.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/viduse.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf8d2588---puvepoz.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/1564476674.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/rifaweraxabawa.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/nutiwitupagelanipe.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/rabirunojusevuraxasod.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/10611496232.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/niduwezozunasa.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/52458134994.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/fajurapugi.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/38802450273.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/7262948848.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/89746424739.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/52128514013.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/xerusejikimiradit.pdfIn PDF document text
    • http://nemochem.cn/upload/files/xogurebujufakejubelilo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae5475737---rulujiv.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ii3or4lq1r73sh4t33ig0sgf69/funovoridadeguvelodis.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/lejavefuzimonidajabip.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9a26248fde81c45395ea66caa9665f0/vusonudivokobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=renograma+con+captopril+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_off0000b870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB870 17060 bytes
SHA-256: d52e1d1f53900c33d8893d0b41e6a4ee5bac354d6211a6e607b4f17c9d7ac338
font_01_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 10840 bytes
SHA-256: fc06d7d59ec70df796224c4d452d65a89cbf67a78e0316366cf9e13ca04f0f4f
font_02_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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