Malicious PDF — malware analysis report

Static analysis result for SHA-256 9103a97104493cce…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 15:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2ecc7318c5921fce8ed00cb6c7a9292 SHA-1: 9df214b6c174e7adeb7ccf80c540346e7e60f84e SHA-256: 9103a97104493ccedc15a41867d4b2cae4499ace9f8cc6a5b7fcb6f86738c9a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to compromised WordPress uploads and disposable hosting, disguised as a free book download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. The presence of numerous links suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://videofilm-tv.ru/content/File/80731848732.pdf In PDF document text
    • http://www.fonfe.com/uploads/files/xudixapudibebufomusul.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/ruzoguwipepesetodugerale.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/30223436861.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905232828.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/gibilisawiduk.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/tisowojes.pdfIn PDF document text
    • http://erictex.com/ufiles/files/zemoki.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/7854170440.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136439b43a31---48717077980.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/82343911763.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e26723d0f---5846809933.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/70334486311.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/36322489059.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wubavuvinebo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613749d1dc515---49047820138.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xafuzesa.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc35c8bde---gajivikasoderip.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/tusedilebuve.pdfIn PDF document text
    • http://cartopack.be/Images/file/xijolalifajesuj.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/guralujuxubujovelolapabug.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/43126060381.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/69634720562.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/navovasonozejuwa.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/41976196465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dracula+book+pdf+free+downloadPDF 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_off0000c67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67A 10672 bytes
SHA-256: 083d088fd7131dca28de0a6de2bd5002ec5e85c80a94183a9b84964db8a04987
font_01_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 17880 bytes
SHA-256: a557dd9d1a9c4f0620a2a6eedc091a45bfed101a0b80e78f6b65935ef79c6fc6
font_02_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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