Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c2cc548d72f061…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 06:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fea00539a40a3f97003853921409f1f SHA-1: 06f5d4ae91597bba06382ef396162c40314dae84 SHA-256: 16c2cc548d72f06149e7e2c1b996f2f7464c5b7e0514b323718883fa5478abd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of these links suggests an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://ajivikafinance.com/userfiles/file/90654833462.pdf In PDF document text
    • https://goldenapp.net/file/tigipupu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b7d32859a029c62b76d16ab2f877b246/fuvaririjudosumaxaxeb.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/geduruxigovib.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ece4237c550717421c3430808356d854/zaxumajeg.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c9550137---rozopigopa.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a8a2852c06309032e43a673a3674d630/64392283919.pdfIn PDF document text
    • http://salkim.com/userfiles/file/3504917482.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/33214572365.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/tuvakasokutuzodorata.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/bivodidovakavugiveder.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075520fea744---pepazijipuw.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a421f995241---19095195802.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e6715993---wixiderefa.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607addc4893c9---53149460699.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/bumexigav.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a696695264f---bejugarorafetigelibarin.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/sisalawonajawefu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16095ceb84cba7---4764512252.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0d904702---fiwixusevar.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d68aa976139c0a780f7f46decc932cb8/2762279231.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5f43f729---mifimanivobamubi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6cef0ad59---64955878119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+ielts+general+training+reading+practice+test+pdf+with+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16956 bytes
SHA-256: 66fd9305741f9949f091b6da16469e7bf9b4392a5440e0f221cbf6984c98876c
font_01_sfnt_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 10844 bytes
SHA-256: 4a0210cd8699c37f3d7266a8d1b661771363f2f88bcc208bb9ee677c3909e5ae
font_02_sfnt_off000139c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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