Malicious PDF — malware analysis report

Static analysis result for SHA-256 99af8f72bc1a8f5f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 12:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52cc01806a5b91a2877b9b93d950ac14 SHA-1: aa43fa13f273e6af8ad2c1bf9ffbb70bd401efb6 SHA-256: 99af8f72bc1a8f5f2c4a95104c7f6e9d0bb3466dad3ee0904e60a174d3809bf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall heuristic profile point to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://archism.ru/uplcv?utm_term=career+path+law+pdf+vk PDF link annotation
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kosikodo.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/29767792582.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca08c27e00---xanizezifosak.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/10475e1035f4dd36c5193a86785edca6/regokojunoxisixizeza.pdfIn PDF document text
    • https://blugarden.eu/file/nigix.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/zigipa.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/faa2f9a7e95594c92c850d3e8c9b0160/41545147395.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/35401541156.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf7504974---jesad.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/17139175898.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/bibokipurexixitesukitap.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20218122217496316.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/63131095025.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077af26d1fbc---medagezof.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/92464273861.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160942bcadc73e---44485257849.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e13189a4051b00366290b3e34e84440/58488751022.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/5429555459.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/52072538003.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608408abe0136---xepuzimamixikidaletoruje.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/f4rsjt5ep4f9uti6e978p6ohci/nimadewade.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ae281949d5c8b596174ec7a54743f0b1/dereloputidezijegat.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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 17320 bytes
SHA-256: 0fd47d3f75721d5c160794bdd5040258a8ce2a73b715ad98adee7715fd32eebe
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 10384 bytes
SHA-256: a51e54c486fd778c43745c7fb976af20f555c05cc00f9bf22dc2b1b0128b1856

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