Malicious PDF — malware analysis report

Static analysis result for SHA-256 508ad3e59b58eb66…

MALICIOUS

PDF

78.2 KB Created: 2021-08-07 11:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8cc7fe113b8fa13b9742c2fd7ea7365d SHA-1: 9a036e0780c9df0cf005d4807c8a33b233e0a456 SHA-256: 508ad3e59b58eb66cc6791f0a939f463db4f895c605225407076817cc906f91c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to redirect users to malicious sites. The presence of external URIs and the nature of the embedded links strongly suggest an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=printable+coloring+pages+for+adults+flowers PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7808db2d63---fevigobesatemipatiruduso.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/25789135895.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/uf1ue8aq3bdqdfr17rb3bm56v0/fozafufupul.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210601_96B73CCA0AE125CD.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160899296cccca---fewidiwunapu.pdfIn PDF document text
    • http://sgpeo.pl/users//file/4067144109.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086224319703---zolewusunomoko.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/84722515737.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9da145c5593a6f1f5fb3525d4d37bc28/rigamafupumusitofupavix.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0740d8690---939122843.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/abbace5c9310c7020a27e8c0b3da56ca/57066135596.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/27939ca31405bf8d4b2049d0164b682d/69132004149.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c548633e3b8---taruj.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/57245069711.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/40cbaa5197f77e534fb46a15f3afd352/7457478383.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c05a77511---pujevorefafaledapomu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a4364d55a3d4f0a00d45f06a4f98e2df/suxanuzuwaxukegaxuwazude.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/83095371302.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/72269410651.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3a4e1e2105650d0f24a9079ec2ecab3d/binubokovusuwewu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/afa5adff2eb32350bbef6b9eab7d742c/99583197236.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b205205f2---57161374476.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_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 11124 bytes
SHA-256: b13d3c61abdb45b28156c1f62409808e64b34e72c4a9403b1b0f7f2310289369
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 16368 bytes
SHA-256: 2fd8cf5ed2afe78553242d104dc7c6f05a76936197271e0e4bece0d93c07d311
font_02_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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