Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a00d2609c8186ec…

MALICIOUS

PDF

89.6 KB Created: 2021-08-26 06:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b2d8d790cf126edaafb0af160fbaa328 SHA-1: 0a739d52c94bf047c458a428651c909b8252e7bf SHA-256: 8a00d2609c8186ecf44e3d057d5ec2af1306429f1a970a8829310e68fc1c9501
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the structure and URL patterns are indicative of a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d21968984d621570e8bcd6b92d88f2be/nuzelinotojopikavavekoxi.pdf In PDF document text
    • http://marketypik.pl/zdjecia/fck/file/xozibalezigiluki.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/57388983497.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210702054356_fiug1x.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/89041262144.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083045eeebd9---42196175740.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bfbaadef735355fe09d4c55274007ff8/kegapesebelefodujopak.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de6c1025735---pexazuwukaxatej.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/jemufudadaxunigir.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/gikolu.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/87682561475.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/padivuso.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/bajevidatiwan.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/28531086659.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ed99e90db---bexuxiretizeduf.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090abc62d584---65749709406.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1518c35491afe759bac2298ddcff022b/68388473902.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/12679519649.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e34e47a39---vosefas.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada062c46f---budigabel.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/levuzatajamokuxi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca318985c35---robaj.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/78990255316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ascenseur+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 10208 bytes
SHA-256: d9eda9d3444972b72830154a229dd46f9b5d8f155fab844b9732b1bfefd97f84
font_01_sfnt_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 2384 bytes
SHA-256: b337caa5173463928754652904a7a8a98f1b0906da411461fdfa58a4b1f722a6
font_03_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 23060 bytes
SHA-256: cd29454bc28bec96918dae92ec151289d2f871e8a2567ad60aec89945c6768af
font_04_sfnt_off00013e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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