Malicious PDF — malware analysis report

Static analysis result for SHA-256 17505b3ec02cd825…

MALICIOUS

PDF

84.6 KB Created: 2021-08-20 16:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b28f04bf08b89e14f34cf674c69ba798 SHA-1: 7c283bc7006d234a49aa1062ba759249ab28571d SHA-256: 17505b3ec02cd82533b06572b26e298a7f552ac4a50554d9ee4bf72938d7e8a7
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=pelicula+de+milagros+del+cielo PDF link annotation
    • https://tauthuy.vn/upload/files/4165551064.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/tefesarejevisal.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723d1fde4f3---zozorarikeju.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160708d0d36b1f---46715795143.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/nuwulivokulokuxumez.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116a6c18733d---jeroxakigibupovajoxotew.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/btgdh1g23vt0nctnhpf8530u9j/fabunufati.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/nerutamido.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ddd600d5---23519882244.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/09/file/70923845085.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc888d90f9d---65240983739.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/96147906788.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5rm69i90u5jm7hrp3j2bje46nn/lekegavus.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/4068500841.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2853fe4b58---85832596179.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/73794412145.pdfIn PDF document text
    • http://brukbet.com/user_images/file/4966550352.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/bawokakijemobutelom.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1693cd3d96d848cb7eb1cc65ee84b183/nisiw.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tisurakuwagironosuramu.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/6790873374.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/23fdd11651feceef34b9a05c2d8debc1/gezej.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fa6ab3b6ee9ed2385d74f7e38b3a9001/79695655906.pdfIn PDF document text
    • https://menu2uplus.com/images/file/46996315852.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 10612 bytes
SHA-256: 6000bb6d62cdb4aa0975ed386e4258bad2eac7d01bbd92edebe058c9c563018b
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 21416 bytes
SHA-256: 33b2d6c4521468f069dcf8166f8123ddad4034c964be922952b5dd06843942c3
font_02_sfnt_off00012af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1