Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f198f2fcdc9db26…

MALICIOUS

PDF

84.0 KB Created: 2021-06-30 20:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90f2d54845f5e9d27fd6c862d9922c59 SHA-1: a39cf01f5822c125909b3d39e19aa091d15d4447 SHA-256: 4f198f2fcdc9db26d4f6ea88aa0f936b06f7c1aa68e4f074d66e3a6ab561bfb1
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 and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware distribution sites. The presence of external URI heuristics and the compromised CMS upload link farm rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa490a98c0---gubunotirimu.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608156d5304b7---43171686467.pdfIn PDF document text
    • http://planetamama.ru/files/file/1233354423.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/76262353332.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801937ea9dd---34952205246.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/xadawarefitikelikowawowaf.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/11jh4mp783sep4m45rlunpd8t3/dukafazewabe.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/jedoranagosatinuzawol.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ad155bd981edb96fe62110d482451873/24611612699.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/wokisidapaje.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6de79c821a9fcd84bf9121deda3ce51d/23777889194.pdfIn PDF document text
    • http://ubest.ru/images/file/xutiv.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/95522313680.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/wewogugas.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/gewukaki.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/1f71ade2496d43a8fc912b7cdea92a9d/ripibegovotefomos.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaae493a70---nogilikutumudibilujolefu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/virezezerufonigutodutem.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9c13aa8b6a9707f36da403ce70532e30/porelexuguxekoz.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/xemaxamobejaxujesofoket.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/55426369223.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/59783735826.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9c4ab514---dabagufe.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/23847315167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=poem+about+selfPDF 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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 17472 bytes
SHA-256: 6078936040a6c136ec39f82327f07c738104338ba9e238b1ea70a0a07b4fbcb2
font_01_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 10320 bytes
SHA-256: 2443cf130b926550b8a8b9efe2b1a7027f0c1d6c36b4d556c93a9d5d999acb8e
font_02_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1