Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1d5596407827ae…

MALICIOUS

PDF

89.4 KB Created: 2021-09-09 15:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af332ca9bcb20d2881b8828a095af648 SHA-1: c5aa3c781fae9fbf8783eb4a964f240090895f27 SHA-256: 0a1d5596407827ae03cfda763aa9670533ee489af08c93e0a049b99748f515cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=the+space+between+us+full+movie+with+english+subtitles PDF link annotation
    • https://shinko-tw.com/UserFiles/file/27674287827.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/97619879303.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/37568703693.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/55293117523.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/11474997601.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/magegi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/60c69cadadf20724301c198103bbfc5e/9676379180.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/81035759824.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61324e9b3e36a.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/fokexalenumufowab.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/maviripasirobiw.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/rafazeveguwisokifo.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/66248045741.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/wetofogafoxi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4b6238ca---42835092256.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/87245394869.pdfIn PDF document text
    • http://coachhouse.info/assets/file/ropilegulat.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/wagukasovabelev.pdfIn PDF document text
    • https://dom-titan.rs/files/xuvanotikisofugoj.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/voraradinutokifonuwupuvas.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/54192474275.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/nobalawugevinazogajemedi.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/11166001343.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_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 18248 bytes
SHA-256: 6bea180084cb974f724900316bce4157e18a4c88002b9e7dd97641bff3b8ab3f
font_01_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF6 11180 bytes
SHA-256: 8205f08de9a38597b0d5796da7c19115c4cfa68e5625f1154f8216bfe35d5cc2

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