Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b5caff7d5978d5…

MALICIOUS

PDF

95.7 KB Created: 2021-08-06 05:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba953f692214beada781913c363534f8 SHA-1: ba2aaf1c82ee1ca6ec4bf12744f4b6af250a29c9 SHA-256: d0b5caff7d5978d56b2061285b633139e807f7a6158c9a464a5b2f6c5aedcb65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the nature of the links and the PDF structure strongly indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://dnepropress.net/files/file/14461699197.pdf
    • https://anmimar.com/royal/userfiles/file/49283163219.pdf
    • http://werder-ritter.de/UserFiles/File/galugalavu.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/vapunotox.pdf
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/faxozidol.pdf
    • http://architettogherardi.eu/userfiles/files/fapusovovaxul.pdf
    • https://sukhayurveda.in/userfiles/file/36149735775.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15602c455---wulinolosi.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5a9d9b89---zewebasomakobavomuxijomig.pdf
    • http://nineslash.com/user_file/file/pozore.pdf
    • https://uleiuri.ro/userfiles/file/pegadufelizabatawejujar.pdf
    • https://ikansambel.com/contents//files/pexuvabuwuzegefiwanavavut.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ebb421e9---25550354920.pdf
    • http://japan-railpass.info/images/blog//file/jimepixunuwalolugezotem.pdf
    • http://zaun-produzent.de/userfiles/file/91933446324.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/aa04273af7d650a55030a35f9c236e03/xosuzemusufuvitukibixumin.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1d519052---mafotumojowusavaxadujo.pdf
    • http://tfh-filter.hu/_user/file/19910463395.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860600a2f73---wojuzefirumegumaf.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c394c80b9e---18373589019.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160733132131c2---mosepaj.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/43935180218.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee4870c96---87770253667.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceba3aa1b15---88047863705.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c69da2ca16---sowopudurawaviluma.pdf
    • https://mayphotocopydogia.com/upload/files/61469512682.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+discografia+jose+alfredo+jimenez
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f412.bin
031ac8cb2a28ea5b7b5b964aa1a305db46284131b1b753d5f89d3c8af2451d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 19312 bytes
font_01_sfnt_off00012596.bin
540206987ae1fd1c1298e3f0070337f658b496ea642c285a6c07ab64aadc9d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 10912 bytes
font_02_sfnt_off00013e94.bin
ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E94 16944 bytes
font_03_sfnt_off000155e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155E6 16792 bytes

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