Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d82aa38de13136…

MALICIOUS

PDF

85.9 KB Created: 2021-08-12 21:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3ff4a54cd5790ed61be87ce8dd6decc SHA-1: 65bcbbe8dcf019d4b845fe7d438f3a4a967247d8 SHA-256: a7d82aa38de131369a612987af1449fdd0d2997861d58f56e9c98747dc94a6da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs that point to compromised websites and potentially malicious content, indicating a phishing or redirection attack. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a link farm designed to lead users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=toxicwap.com+series+a+to+z PDF link annotation
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dabufaxowulilisenekanexur.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/688jerp6da0qlbmmndsmf36s37/61829690397.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/tebulap.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/murawatodelesuke.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/85225237000.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/pesepizopawavoni.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6e26b268792b2f759b8631427be2c444/tarobupoxifabizoxuzodofo.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/90969995026.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c46c30dbd7d---nawukusas.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074191ed936f---keriwuduto.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/zimawa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ha0c7ladjk4fp4jtuuhm096ceg/buvatoluxiz.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb93f1584e52d08ac63e7a93b768011e/xerurixizega.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/falunurotizuwojufomedo.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/58652358023.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/52015161133.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2n6lu3acn8jvktmauhjgophsq0/nifubopi.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/bufuseput.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bavavatiseginefufolas.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/37299464779.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/jamolapepusafibojaguzibik.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/68767af7da6ae56f8a9cac9c0ae211f1/53854461430.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/likokud.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/3907894052.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a2607e4c3ef---xunusovoragukuter.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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 16628 bytes
SHA-256: 02c31c2a696e7c8734dd2b9513345834aceba36117adf9ffb20d0d9fbf3abf4f
font_01_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 10660 bytes
SHA-256: 9c3b6a1637652bcb8bca95598c13d7f5fab856fcf82988bbbeaf56646548e715
font_02_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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