Malicious PDF — malware analysis report

Static analysis result for SHA-256 573f7ac1d9915f10…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 12:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3637fc9698d7c5bb606ca4b21a7db28 SHA-1: 00e0397a8edaf27a17724f719b67187047fc29ca SHA-256: 573f7ac1d9915f10335518c8fa0febd5652c2631fad2b850bb60c6f249aeec9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. The embedded URLs are designed to lure users into clicking them, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://xn--tnqz8hz5cb8l.com/upload/files/pajukogowo.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7fc56b220bcb8b4a0d2882b60b8e5f98/zibadovuzusegude.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/sidukub.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fj2tk6g5d64d1ev66qr7m9kb30/bolegozanozewen.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/siguvufogunonapewufemizuk.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/bifelilupebegikozes.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/52582804857.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/87167266036.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/93990431839.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zupujuxedabiridufitolu.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/56467019250.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/8204342548.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8909beb6---45549915413.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/lomunavalilaki.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/63304004382.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/18260499878.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/jutadaradakevugoxop.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/84788612263.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/97873787690.pdfIn PDF document text
    • https://phr4u.com/files/dekamigofixizutub.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/zunasavonuwodoxogaxoje.pdfIn PDF document text
    • http://15881588.com/ckupload/files/30919005572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=to+do+reminder+with+alarm+apkPDF 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_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 18652 bytes
SHA-256: 267470fc5133a19cb7ea11993020d8d913b522a343caad20c02ba6334c72a725
font_01_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 10628 bytes
SHA-256: 95c4cb9891037341d10849320362ae91e97929aca88ff2981db148cc905d1cd8