Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4455d844ec1eb75…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 21:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f80f4cda582f904ad95ad16720faba6 SHA-1: 2953deed7c0e9ca1b8634c3916636d1d1a5babca SHA-256: f4455d844ec1eb751a6f81c2801adb963a91482937baf9c4988260988f546701
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mikailang.net/userfiles/file/20210910044728_396016397.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/af03480e75bbcfd6a22e64de8e733aad/26422177013.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/83804666545.pdfIn PDF document text
    • https://bdata.vn/upload/files/7086347328.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/55385923479.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613905df9c4d3---rofutepesazajime.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/1556264486.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/refajegalisiw.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/15147410947.pdfIn PDF document text
    • http://klaaswester.nl/img/file/9547645110.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a09150094---kolofumoz.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/dotuduvapaxev.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/3136283585.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/87285010990.pdfIn PDF document text
    • http://potlista.com/file/files/74777434182.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/22359810992.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16132e454c929f---44237008408.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/54900341853.pdfIn PDF document text
    • http://teresachild.com/upload/files/24429952530.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134781d6ffe9---87162100405.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/44283291293.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/28934006814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+haircuts+for+each+face+shapePDF 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_off0000b4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C7 16068 bytes
SHA-256: 08001f54f21f6a330fcc789885302df2edb92eff97e6c02f5bf13ccbcd348e1d
font_01_sfnt_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 10580 bytes
SHA-256: c48e65be2f5a305db562b962e53cfe9e3ace96f08b057f6e1bfd8b62ea68716d
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1