Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e50a36e9c6baba…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 14:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8840383d2a895b56452baaf071954d94 SHA-1: 315937892b5c1175b435752e59796e79e46df62b SHA-256: f0e50a36e9c6baba25531bb567ab8a5038199a646406105a04ff48b567206124
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics further supports that the document is designed to redirect users to potentially harmful content hosted on compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f30c0e219836420f7fa20ab134e64f04/punelisujaposusu.pdf In PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c63857dd---tadaridosizabavobisubikub.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5af49f99c---nuturupomewenavopelipu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb16b737c7---71640484425.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/404f2d3a1068c2ad928f69592313c6b3/sirulefubufofopuju.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/fesenuvuvexemazozaxix.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o78at82h2l2b67ae75pimbh9e1/gibumulajedexajeluluvodud.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/waweganikaxerisirikutid.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/84272247463.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210622020954.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/76855761229.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd323710b4---zuwodogun.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da7569d1---jovidu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/43a1d13186a436c5f0c7ce9c6f31f36a/95335822483.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9c0ccc1493ac1f92d89a1fbb9b620886/totodubozatamenelowed.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/wurepikuz.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/78518243343.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/51350704172.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/jetopejemogozuzozixo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e5e2e746f7228ff20d6dda5789ed406f/67844600643.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8acab1ef38a202aa183902f16df9d6d7/nakagig.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210610113053_3c5p9u.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/71176632345.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rijerame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=an+emulsion+is+a+colloid+of+aPDF 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_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 17616 bytes
SHA-256: 99040ad75ac1ba1836f3d145a10bbc666ccad40543f54c3d5b59f73d98b9312d
font_01_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 10520 bytes
SHA-256: bd542b97208339d2f1a73ba668c93c092475c5e0fe40673bafc87fc1b79ca66f
font_02_sfnt_off0001381a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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