Malicious PDF — malware analysis report

Static analysis result for SHA-256 597f46ff2d8cef15…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 21:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1106aeff97fafe7e7020e8f32d4a9cb SHA-1: 66972f45875e3f60f7f9317380fbe7687c2fc4cb SHA-256: 597f46ff2d8cef1575ac88ae7522fc91691157299b319a8bb7a6113b647df066
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the extensive use of external links points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=watch+online+web+series+free+online PDF link annotation
    • http://whuntex.info/userfiles/file/99258980117.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/86014829097.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/metojokamep.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210901131428.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/70179347898.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0912/6b4f2c551068d008d8610c776500e665.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/97945961668.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210904_093208.pdfPDF link annotation
    • http://envisystem.com/upload/userfile/files/xapug.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/teduzegegupu.pdfIn PDF document text
    • http://superazs.ru/images/news/file/20382172098.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/26645497199.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/cc0775437a356e2adeb8ce31ecbc01dc/7541282844.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/jamiraza.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/90341356861.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/50955984554.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/13804991538.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70012863410.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/pelarezuf.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613788ba10a19---watagagurul.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/lokewedavatexanifekur.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/biadhj89hlg5sj62q7ccuja75l/44306719236.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 17868 bytes
SHA-256: 2deb6a8af6dc38a2933aeb82e40a36e6a556882cb330445c71cd9217c44d893b
font_02_sfnt_off000130c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C9 10652 bytes
SHA-256: b09c78877ad65a733cc7c0d4fbc49a53632c632662f170fd0c003d7d8dfda70b

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