Malicious PDF — malware analysis report

Static analysis result for SHA-256 809b14a402d31985…

MALICIOUS

PDF

85.2 KB Created: 2021-08-20 00:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76794e9cec4b3dc54ae54150e35a840a SHA-1: 280d5eba8a40da2b47e822e186ddce5f98736d83 SHA-256: 809b14a402d319854c997b436d278ee64212b44002c6c76a5a6db660cb125a9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through phishing or by serving further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=attaullah+khan+esakhelvi+old+songs+mp3+download PDF link annotation
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a3da315c174a04efed48ffed05aa1b63/19773255622.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/zifumasuvuwekeparaf.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xubaju.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c995837dee9---88227408640.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a1342f152624c7987880579eaf420fc9/fabidukapaniruvore.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/61e4f4a66c36dd95e958108893474a3f/wipenilifabozevokov.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/tusutimadiferoxeba.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8c14367b---68461676560.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c18af64155f---44850420724.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843969e4e81---64734928501.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/18473737536.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/2595133231.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/276af19113ac1eb73cfcfb9c5fb74bd4/biwomabodinigixexosaru.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210814003030822.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6e02b50b3af6363362d626504a59bc9e/11990541654.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c928c05bd---88896999262.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/pazen.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/dolajex.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/740880f4610d2de59b46989979ee2558/ludagatisosugavofevorubo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d674141fd---14487954461.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/49112107594.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/61301214704.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/majuxolalirewipu.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/81429866759.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61b8ad4cf5---nefalavazewod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EA 20440 bytes
SHA-256: be6ca5465d81d1091e1f744de27dcdd1b5564812d848f2a8aab20f33bd5185ec
font_01_sfnt_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 11236 bytes
SHA-256: 887361167ea39b9094b1ceab8151bc63806afb1d5074d29617098d48edf2e629
font_02_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 15752 bytes
SHA-256: 49ec73edd018196ad8b90a5511ff77c06b87127acbf649bb4ec618784c15b007

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