Malicious PDF — malware analysis report

Static analysis result for SHA-256 c271f104f765bae1…

MALICIOUS

PDF

93.0 KB Created: 2021-09-19 03:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e256c7ed8d650e2004ab6bea8c36dd4 SHA-1: ddb220323b64a0f83d82577504bf6dcfe30c849c SHA-256: c271f104f765bae156b2468074695794dee8484db2d4a28bf0e0358a6466edac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=last+name+first+with+jr PDF link annotation
    • http://nuraski.pl/wsg/userfiles/samaduxuwupur.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909135507576242.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/17458910224.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/2747381679.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/gufip.pdfIn PDF document text
    • http://superazs.ru/images/news/file/31951869416.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/5806304880.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/zakevavujevilejuwivof.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/20638987793.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143889a11f08---11375231017.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/xebilataxafilural.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210904201747.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109070607242915.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2b9559ad957680691fa9820c00e80417/94024294476.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/vusodawidizivotiv.pdfIn PDF document text
    • http://jinyezi.cn/upload/wikugojivixonefi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d191c77a7---60457872205.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/nukililis.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/xibakusisawogijonuwawe.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/givefavanit.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/kuxizabomadekoliguxo.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/63203134309.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/didolijex.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/57945656772.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/batosu.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_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 10484 bytes
SHA-256: 3f28e92dc1184e3a00e12f751b8173e17f9d09078f0be9e80c48a5be5ab4c8a8
font_02_sfnt_off000133ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FF 19640 bytes
SHA-256: 0a0b00d423e59710e8eb23ce01c4db7db53d3dbadc85b1463c1ef62efe017ef1

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