Malicious PDF — malware analysis report

Static analysis result for SHA-256 155b61b55d49b2a1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 20:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00062c4788eff1a3d12db1923d3bb4c9 SHA-1: 797195c1980fe722354d29c48d6c8257a6cdab3b SHA-256: 155b61b55d49b2a1d2297bb689f08cb092bc57d994c66856bf187bfbf02b2464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pasarantogelsatu.com/contents//files/wuvopadedizadaviviv.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befd9dd2314---4801158864.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/36a5d212e50be1088150e9df221f4c50/romiwolexidudaki.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/52e30ff14a72ebdb59f4777d02950555/90336772687.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c339248ed9---62122193421.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c58cd2dd5---zenip.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160beded035574---lisodonuso.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/667960601eb7dddf1a3c4704951acfd2/53208161112.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd2925841---pafujav.pdf
    • http://nessium.fr/userfiles/file/fosapodiv.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933d62d4cd4---tajerusaler.pdf
    • http://funperm.ru/content/file/kuzolagapebapetazilaz.pdf
    • http://alexhoffordphotography.com/temp/files/file/74065843172.pdf
    • http://highgaincomposites.com/img/file/202162183011.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ab572993ed48bf0ef41e6837b7c582e5/rivamavobewijexumit.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/padesasodinizipezuvubopiw.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hcio0u878ao21cjinhori6rbs7/rotemelewolatiduda.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609102d4c3ef4---77727773619.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/fukaj.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/bitalimemagagomij.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ed2ec9d8---46253191897.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/dojowizazikubugebojixor.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2mp57o7qh8iiq39uok0ffesh8a/soxexikudezunubenowefibi.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/40f56311308f838394d04af1bcdc9f7f/xinifedodigisapi.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c710bd1b693---rupobukozanazapomi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=practice+test+for+acls
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecaf.bin
fad06c170df3dc4197f5129c7150751ce53cdfd15d4dd9d40343afdedfab98b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 17828 bytes
font_01_sfnt_off00011b4a.bin
19b29d82c897b5677d590fc4b302fca50581f81ad818e0f4e61b8d468c8310fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 10224 bytes
font_02_sfnt_off00013263.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 16792 bytes

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