Malicious PDF — malware analysis report

Static analysis result for SHA-256 256d3202303008ba…

MALICIOUS

PDF

81.0 KB Created: 2021-08-30 19:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ef5eb957a0a587fed38bebcf5d59f876 SHA-1: 99418df4ffde8eaa93f4fc9e1d1affce5cfd610e SHA-256: 256d3202303008ba822f6f7a221db39ba0550fdbbdcfaeae40da5e4874e5b9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farm patterns further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=if+5+is+subtracted+from+three+times+a+number+the+result+is+16 PDF link annotation
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/77319616190.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/15483359448.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210721151209.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906843755f8---50080071491.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8440994f03---xapewunulakowavanal.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/061ba886eab2342fbd790f8a6243e182/kaluluzidin.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/91132286042.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/41964644335.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/vufixugexuxinesame.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/99530012662.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210726103550_zzhgag.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/25cc4e8e6d27c989d85e427636cac810/29037431010.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d3732d207fb---40974266142.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/88385470868.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc45e40890---78185045036.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/87883067570.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9e27eb17ef8e159efc3bf193aed96838/bibuvafixoli.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/31748078253.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/jilitexibakox.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/degitagonas.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/5881949443.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/milibe.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/sigedabepinurofuf.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6733c0349---84825759188.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129b999c9f4b---sidajozazij.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/puxaxa.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_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 17704 bytes
SHA-256: 8bc341dcadd507b35b72cd66147aa3691793ebf7e514ba1c3442807c44017122
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 11288 bytes
SHA-256: a53c198423f7bbdec564cd6819608b4f0472bf54939585bba8ae68de65b3eb21

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