Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ee2c1d999f3792…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 09:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f54acb48c6fd90063317de1c53006a31 SHA-1: 6a938bca12a287e52b346f25f466a2e15fe22f4f SHA-256: c3ee2c1d999f3792319feefdd5b19d1006dd100e73a8668b8ce2b5dcd62a5712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicate a link farm designed to redirect users to malicious sites. The primary function appears to be phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=miele+washing+machine+manual+w1712 PDF link annotation
    • http://dalnoboy.org/data/filestorage/upload/files/pimafefatudokutak.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24fa0e065---jopudegomidarisitaru.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/pexegusezudizofab.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/benuko.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42793674123.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/18995445574.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6182491ce8---mowidawuguvulokunad.pdfIn PDF document text
    • https://tavio.ru/files/file/9864519341.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/dunidejuxepexipa.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/82127711283.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/kuravizinomawonaxin.pdfIn PDF document text
    • http://prestopc.it/upload/file/putexokof.pdfIn PDF document text
    • http://contextuae.com/resimler/files/maduzekenodafada.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/bigelojomukapara.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/67378238206.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090751767a59---5168605697.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/dozixogezosi.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/41411599166.pdfIn PDF document text
    • http://raczcsalad.hu/files/tobapofinadidawotu.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/88869259172.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kemanavevejenusativejoku.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5031fb7d1fac3a63a6ed84039f9a8a80/surulozo.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/89527061999.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef898ce0fe---wawotofe.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/nojepol.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_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 10760 bytes
SHA-256: b8cd30bfb111a0e7b5d14bec388992811bca250c99cb1a60085ae896eae184c8
font_02_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 17112 bytes
SHA-256: 0e53878eff92a25c1f5ff2fc7e81cc29038d87e68e26223274d474beb89e96ed

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