Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fb04ea8cde5818…

MALICIOUS

PDF

82.6 KB Created: 2021-07-26 06:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1abc31f73a56cb8bde6c946e95f2e94 SHA-1: 6bd290201a5a8ad353e9a50a3fa3b4f7c30c0b92 SHA-256: 66fb04ea8cde58187d95154c917314991cd076fc1fe46d6c37120741e2750a90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it with high confidence. Multiple heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were directly extracted, the nature of the URLs and the detection names imply the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/cfe6748a954ab562aab4290de0fb874a/zonokibodifite.pdf In PDF document text
    • http://beautifulmoda.com/userfiles/files/xawiw.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jozofuxuxafuzadogo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/23704713308.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/24846381460.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/46343159419.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/49dc377096d111258122de965ab91b64/99304174328.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/76992077395.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/bakofumanezedujagaw.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab0b493414---vakubumedulunoda.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0da937efada026b3e3e9124bbd1f29c9/97297251799.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8101782992.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/roxedulum.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9944545fd291073781919a7700f58031/45553557628.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5167ba28ee---66260755026.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ulmjh0lfrk8tl2m09rh4v854ff/bisitipafinovepatuv.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/520a3003d87ce02d10736046ac3e627c/xuwodaletixo.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/lulelijutadufivosa.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dv9ha39qifpaoab67cqliul9ai/76950230807.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/43071826520.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/aeb8976a521e9a5bf9295e98b45e58a2/solubu.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/munola.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/79068493979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=reussir+le+dalf+c1+pdf+vkPDF 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_off0000c086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC086 10644 bytes
SHA-256: de38e0802913afbe574ce34c5312761719268a60babe30f886c5d7f1824f72b9
font_01_sfnt_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_02_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 21628 bytes
SHA-256: 68fd3897fb691da712566e5f172fe675cafa5c538493179c15b5687bc42e9f34
font_03_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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