Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b1633ee8f677e1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 09:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90cd0fd6b6c6f7f30af9c6da2e529f9d SHA-1: a4c9bd3667dac0f54b2f31cb78803bea50e85926 SHA-256: f3b1633ee8f677e11d1e78c37233ad7f1556ed91bb92139ad5c62db47740afe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=indian+movie+chal+mera+putt+part+2 PDF link annotation
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613338e1b5f3a---45900066031.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/39787742088.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/vubobiw.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/rofekifaboba.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/pakexumewojeteraxasumuw.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/74304833968.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/67367907700.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163058672916.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/sakiwitixilu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e1232a41---nofukamiw.pdfIn PDF document text
    • http://abwessex.com/uploads/files/55626254067.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132905cd32f0---65535518526.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/pefisowovivaxowuz.pdfIn PDF document text
    • http://domplus.su/userfiles/files/funuvibolofefifo.pdfIn PDF document text
    • https://wrd13.com/force/file/fupidafifoxowekilino.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dusesufurufiwod.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ab0ht168l2qise38blrflqdoc3/67020889536.pdfIn PDF document text
    • https://norservis.cz/files/files/6373769132.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/gibaka.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/26701724577.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/jinomosenuna.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/65107823672.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/57066738382.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/25360241583.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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 10848 bytes
SHA-256: 58f3fc99b606516e507920bbb943ffeec6080b1ec3698d6155b05ec22608738a
font_01_sfnt_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 14920 bytes
SHA-256: f5cdc993d46800167fc2935aa6519fe8b9d4239128560e6ffd8a8030d79322da