Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52fdfc36f59ad69…

MALICIOUS

PDF

87.7 KB Created: 2021-07-04 10:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fb511b870deeb9001cc42f569edf005a SHA-1: adf95988876e45a8eedb6f5c5b47527c4e50862a SHA-256: f52fdfc36f59ad69e3c735f63b25b341cf5f58e69f036a08c73fdd09437d4336
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous links, many pointing to compromised CMS 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 heuristics and the embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://actor-conseil.com/files/file/97919396212.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb57db996e3---jabebavapukokev.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c2cc057e---35994180626.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cea7e0dd44d---28544690921.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/435901d614c77ddfb70df63b7f4dc0c1/sugamaxef.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/buxobafafugeninil.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210617122341_dg97vm.pdfIn PDF document text
    • https://premium-house.uz/images/file/lixokakaz.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/530f3d2d138e9ea99064377afec43c83/29854354366.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/92600458272.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979f54e90ba---sugirefido.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ccb3da1db---zefenenuvebot.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/zobazuvofafugiw.pdfIn PDF document text
    • http://slsnn.ru/content/file/lesibeximigipikuzer.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/66324244672.pdfIn PDF document text
    • http://alptw.com/images/files/sezasabixukel.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c9f39bb05b3ae61853c2161d85b7ca0f/93602548452.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/50132243218.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/17147b42045199586e1a0a11f9d75c1b/zopizaburegil.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061409504474.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6akpj9hv17o3u4c809ff4f5jar/fapepiferevas.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52dceb1080---tudopipus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=brand+name+logo+quiz+answersPDF 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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 10940 bytes
SHA-256: af97b567bfd64aee2e43c44b491e51af14dd7cc6d22793b769bd41353bf5e81f
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 18196 bytes
SHA-256: c46453d81357dab66771ff7c25adc71abc1be14373e4352870b137cbb1cac236
font_02_sfnt_off000139ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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