Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd50a06a3e70dc7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 04:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e27877bbca948da8b2b8eb6e1608e9ed SHA-1: 66dc6a2bbbbc7cd5ca475214c00eee7e4debe1cd SHA-256: 9cd50a06a3e70dc74c1269c87f13beae4011f6eb8626e98d245b67d6e87dfb23
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of a link farm pointing to multiple compromised WordPress sites suggests an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e483401d7aa---lufojodekoporiveluroja.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea353d05a3---pukalisutunuv.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/xatugojivurunemejezeredaj.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f090d0a1ec6d74869712fcf311cafb14/fiwepebusut.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/de2steeb6gof5s2t6vfmcm4v2q/68874877018.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/24271460301.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072da9c81dd9---wipagabofaxukoriwode.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759607ef84b---30764616585.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6ci09fibf2klak9vm2ak0j3j8i/xaviratogaletulubirot.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f33cec382bb94f71822632cd0c988f8d/niwupemeg.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d8448be2---60749616575.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/50516324931.pdfIn PDF document text
    • https://advik.net/userfiles/file/tarisisutanebaz.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tnilc6ndbj0oq2h2rdpk8aptlr/49392984237.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/187774c6582b1e6ed0cfc7df99a6f7b5/fotop.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a26771e5889---39835607147.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d0c12526---pezovoguliramomex.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/46670880850.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/76759297308.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/filonorosipojodogoxiwuxe.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/77695145504.pdfIn PDF document text
    • http://clerus.hu/files/file/2993833717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=technicolor+router+dwa0120+manualPDF 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_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 10912 bytes
SHA-256: ee690bd632fc9482832a98b5488b9fd70420eaa8b0e165a9626e5f3ff074ac0f
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 20272 bytes
SHA-256: f08a93b58fc80fbe13ae217bb12f7ced7575007f9b78de1bbcd65e34e3201a4b
font_02_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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