Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f47468291f972f3…

MALICIOUS

PDF

123.1 KB Created: 2021-06-28 17:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f0dc152565b786e65803337cb35da914 SHA-1: b2a540708611f6d7524d125df5ea33bd69fb0965 SHA-256: 0f47468291f972f3d95c922d8f47db410a2bb03f60e04e9db7e7706fb70f1de9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics and embedded URLs points towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad9ad6653---sijuzeworogaf.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d4e8419d52a3ab95bc0ccd4b9f1ab66d/ruwomupiwoxifatepul.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/32632290193.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3f33ff5a91ecec40b91e975188920f50/fegonitobeju.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/20079043590.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/tbvcipfkvk4hfletp0f0sg74n5/losoxoxojulozoraratetu.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/lasate.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/jowalukubatiloromalapukov.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/kananukelup.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vitibixinokabo.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/risep.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/dovesoderijini.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06aac7d92d---xukupefig.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/27957437816.pdfIn PDF document text
    • http://runo34.ru/attachments/file/bubuvaviripeza.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608011e144a46---xulunotuparidumasariziwaj.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/repumevuxoko.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb7bdacd3---tiwaselamoka.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8624e7109348f8c1d678dfcbe8953c6e/48429712834.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160773e9af1923---josebukirepokafa.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf6f44a17---31215324568.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160addb5450f0d---27968400826.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d785a691623---23233006211.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d4ce7b39---78599069004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+look+forward+to+a+favourable+responsePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a891.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A891 28964 bytes
SHA-256: 1908e2972da07c137a5286b71b895dd854591ef1ec4b3e172e4b2de6b357ed75
font_00_sfnt_off00014795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA7 18192 bytes
SHA-256: a7e1c11dc4cab25e46a19d2d2733064eff15f4ea581865bcb4f31be3d0924fdd
font_02_sfnt_off00018f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F94 10832 bytes
SHA-256: 1b66cfae4dbd7732078c46238ea7145ee9a1e1253ccaae83e8a0b09502f3f3fd