Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f74085f60756d75…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 04:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07e5d21d75d4c47e35ecc443a8c4e1c4 SHA-1: 441f37b4b59cb71fb41d6633312a827f8604d00c SHA-256: 3f74085f60756d75355abcbefa46d639cbc3deecf40ccc30bab1bd89b7a575f6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=choreographed+dance+routines PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a78afaa1---tovixuvokokadamesosorazov.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/memirazexedixoxor.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/subepepezesivudug.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/32469512715.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9287dbb9b334ca33f0ed054f56de61ef/dezitixori.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ea273643---50340172391.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9549a00c94---14231298758.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/zafonofepefaz.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c9827e4b538---lobonazonirasukekon.pdfPDF link annotation
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af081ee1c0---53287271337.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59305c171---geparuxowujij.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/cnn2mvrirqfi0pfmh6usjo9ti2/34272990796.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/12d66491c02e1543d76a93d16fe78f17/7450474823.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/sexepenuxudamegejoseduzu.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/rugukarifexisoni.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/temisujajanipogep.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/batubekewasokip.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/donebilofuwewesifazisut.pdfIn PDF document text
    • https://tempegaring.com/contents//files/63653996090.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/be302a83d933ae48bc7378ac881e8f43/zepozirurugigulegavus.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/dotinojupuxizovatijexonop.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/817fe1e378b8570387044ca01d85d09a/13388751696.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/488ef5cd8a1347e9f7a5950f9be56d4b/85022038444.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/86168368769.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_off0000b81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81A 15568 bytes
SHA-256: f7649a3ad10e0b997f4ca74bf01671baf1257854535f2afffe2e916adec76fca
font_01_sfnt_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 10876 bytes
SHA-256: 8475006ccc87e258043e292e396e38290fe4e8cbeef4d9062bb9377ab7bb35cf
font_02_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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