Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90022a9093ccaa1…

MALICIOUS

PDF

102.5 KB Created: 2021-08-10 07:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5ea81ca25403e25a7c6f6bd38feb175 SHA-1: e703de5520db96e1346956e387c3cf405084193c SHA-256: c90022a9093ccaa17c1f01ccd304c34543d5cc00787e41b905af996828b3b4d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://itemclinicchina.com/ckupload/files/86750867859.pdf In PDF document text
    • http://snsi.jp/image/news_file/xalukamawel.pdfIn PDF document text
    • https://dm288.com/slicice/file/piwetanexepozebizevem.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160839480070c6---23615591695.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/8e586a849c4f3dda2d58e78ff16abb8b/77677495306.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/88505803896.pdfIn PDF document text
    • http://servmed.net/userfiles/file/50622086450.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/17c033bfe1e6e0f784291f0723e5b27a/53342181289.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/62769476946.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1056df89---judomaxivububuxezelan.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/jibev.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/v5aet2og1566k25fd7ahutq9t4/10024179959.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/84968456762.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160982e071fdda---donowetul.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/41937837221.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/vijufelorijilepijuma.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/jeg7t94sbpdus7scq150u02mbn/55614841612.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac90c3c85---29722634317.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d23edb41305---98558268003.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160822df492bdd---15096594043.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/zikuxan.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ab8d146d---suwideporesagurafideto.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/568531a20f8ff88e66fd9f10917af424/sonikoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+study+for+arborist+testPDF 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_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 17800 bytes
SHA-256: a74e2600f3dd6b276d9301577287617cc82b760ebdbdbdfde74e0150804cfd97
font_01_sfnt_off00015917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15917 10628 bytes
SHA-256: 53961861debe1283bcfaa411cf15d4bff6f0d46bfd2f92802f392663da0a7eb7
font_02_sfnt_off000171a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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