Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfa166cc8063a6d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 03:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26a0114fc1a67859818b98692532787c SHA-1: 2275a07a945ed041d82af29543a541341cd04609 SHA-256: 0dfa166cc8063a6d6a4ae093f75603aa1e868830f9f3f2b583546b74ff700aa4
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised or disposable domains. The presence of multiple PDF link farm rules suggests a deliberate attempt to obscure the final destination and potentially distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ngonluathan.com/images/ckeditor/files/66459477224.pdf In PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/40083630453.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/nofesubigajorasawizutuxij.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/sexuwix.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a41f4f21b738c62851557f7382ba5e90/jonamevevi.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/lizasapujegugewufabeb.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/kinakexaledixifebexen.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/71919996487.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/1235752458.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/wugojixunopogaxoza.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/wutubiposenevofuxivaw.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9on2ufag59r3djiisuptag5gj7/bagesiwazu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac3799212d03322fc9ae78f1e935de6f/75962762765.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/rurepefadiga.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25085b7a35---dafitifabedadotudiradeno.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kq0fa2ra8io067mu2qkhb5pt76/jesuzixilenire.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/tle5i3o500dhg10s95aid7rum0/59426308505.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/db15e9aa791b1077e610f9430af78a4a/83538985153.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2978530ba9---67949600416.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609441c50556f---mefukebatenutosowidew.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/63641942270.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/20642245369.pdfIn PDF document text
    • http://learningkey.org/userfiles/wapakufagaxavedijizoneze.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3qb0vuoev3qkf31fjolii2te76/30406625696.pdfIn PDF document text
    • http://caramelitos.sk/files/65745497029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=creative+and+design+thinkingPDF 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 10548 bytes
SHA-256: e40cda251309a4baf94787bbe5536e139a726e67ad58c58fafdab601ef2a714d
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 18168 bytes
SHA-256: 6a01444a9744830a5604eded49ebc450be78cf9feb841365885a7168d5bfaf5c

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