Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cb705266756dd7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 12:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48dd0b92cec7ce9e12bcfb9951bfe5cb SHA-1: 911dd607b1ad69054b40020c68240463a519175f SHA-256: e6cb705266756dd7d8239886a95898495d5f3606602bf982bd5f43a74b3fcf08
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=jamb+government+past+questions+and+answers+pdf PDF link annotation
    • http://dsraxys.com/uploads/rogekidevugizagole.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zobesogirufegipatuba.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/68652317991.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/96434f52bc5bbb86f62b9b72f5ca7201/94803859302.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/fibadikiniv.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/zidid.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/bitokafeke.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/42983401676.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf935a388d---8974740221.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/91254a593288329924a929a3f85eab64/koporafivodakudipuki.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/84200240469.pdfIn PDF document text
    • https://ksboutlet.com/file/files/remijegobedanuwew.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab6abf45e---gesaxuretajekorewojezov.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/guwemu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e562cffc0---68832215933.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d273e3c71a18e2eac6c18d7fe83a5ae3/fodogasumevebop.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c5b37a16879fe0270222c7822b621ab2/vogopufonowowajesaleregoj.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/36806817294.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e3c98f4f8a003fb7373a65d3e2b5cecf/19086833188.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a82eecba625---sizunisu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/6cbbb94b90ceee463e2e1d4aecf5eace/42587577803.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1ac80d16411ff3fd42fd4b10ba30e44/xozunaropu.pdfIn PDF document text
    • https://network-italia.it/file/besubuj.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/5394550826.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_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 11324 bytes
SHA-256: bbd1d331e97d969a1da80263b1246c73b82c9c5619a61d847c215fe35a85e661
font_02_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 18948 bytes
SHA-256: 090d04f40c4c735fb6b1fc2a362adc3d30fed4c7c97f70098b8de1575778dc27

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