Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3ff36f937dc1c0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-25 01:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6cb4fdf33b515f6856b44bde79ab842e SHA-1: 8575b4750204ff3b583be0f0d206638e618a11ac SHA-256: cc3ff36f937dc1c0242729e5db0618040b2ecd1d42b96dffc382e83c8f17e3da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The numerous external links, many pointing to compromised or disposable hosting, suggest a link farm designed to distribute malware or facilitate phishing. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://parlagame.com/calisma2/files/uploads/fuvuxozupitejalegolopovo.pdf In PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/woxakutupot.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613663eb21cd7---75366511758.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/sekigopabikonasababonuf.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/71650723631.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/zilokimolikoxibiwofug.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/somejigejadafex.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/sukumunenu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bugukuderizizej.pdfIn PDF document text
    • https://primer-spb.ru/files/files/32082684348.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/metugufajumikajelolonos.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/34008029933.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/35310665736.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142647cce31d---nofonurap.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/fiseseguvanupisavevimusiz.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/beweko.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/tosunosuregu.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74011862129.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bafab0b313---kekewizedanisewo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/821803071.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vutemuvonikubupotowijevu.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/12245040158.pdfIn PDF document text
    • http://kisito.com/userfiles/file/71162877213.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xisajiwijebewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=oxford+practice+grammar+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 17756 bytes
SHA-256: 5b6c1e947ba1fa6fdba2edee1d4438dc30349450969ffc84e1533a96a7bdb002
font_02_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 16928 bytes
SHA-256: ff0dd6a6fd0fa3c08581f4f2a4c194012569940fe5db774165ba0349bd10864f
font_03_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 11008 bytes
SHA-256: 7439724b823396f990b768b0a4a68af10d1eeda110a4c9eab1e0cd2c4b439ae2

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