Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa0399aecc3397d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 04:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11e81f4b028dca996d730926e4710500 SHA-1: 39ff0d9092b739a968de6c6e179a34c4d02a8a1c SHA-256: 4fa0399aecc3397d67942c9efd69579a35b29ef1b75cd9b2f298bdae91eb9b22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=answers+to+case+studies+in+clinical+chemistry+bishop PDF link annotation
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/nukoke.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/62773116144.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b752dc4c7---8843870081.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/gixoxotuwosimanef.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/68347626001.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/vasekukurogavasevoxobubog.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/gakuvekowurepibakesedune.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/47425786419.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/22085258930.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/nipipadujoneter.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160725ed3415af---90021759817.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/35500727239.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833c942e5b---tejupiwovilixijewunowoda.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/8685633148.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/xenoraxezaragaxasub.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a6dd6485---18358495266.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/641a9151af1416f192c08e9f4fdf9504/44725088923.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7842b09eda---sadarelirudedefigijutijiz.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/takilolifakosizezipub.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/54201965832.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/93462014485.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/mujubuxinaworazatiku.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae751035ee---21912842559.pdfIn PDF document text
    • https://assistenza-termica.it/file/jejixanobizatumor.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/bijama.pdfIn PDF document text
    • 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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 11200 bytes
SHA-256: 6f21e565c1a281e068e400d9c53d7e593cdb2bdb76550b73ab68b34b5ac79c12
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 17116 bytes
SHA-256: b314c23d09b556688967c30b8977dc430d5d55589d798e271169a1f1df2802e7
font_02_sfnt_off0001328c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.