Malicious PDF — malware analysis report

Static analysis result for SHA-256 0892923b60222606…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 11:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e1e938619960cf1f8d0245034333b36 SHA-1: ecde55a303eb56e3d43dcfe83adb319365322f6c SHA-256: 0892923b60222606bc8a07471ca609883d75ff73d0d187f9a595316184ea0502
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various PDF files hosted on compromised CMS upload storage and disposable hosting, likely intended to trick users into downloading malware. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://master.plus/wp-content/plugins/super-forms/uploads/php/files/992e9d2e4d319a3867f5f40807f4176f/83213002425.pdf In PDF document text
    • https://izometal.net/mm/file/ruziruk.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/vozovixamodadakevewimuvi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0dd51b013d1aa1f603c46c7e07836d83/zexofuge.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210914_060946.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/javaxigajenatagako.pdfIn PDF document text
    • http://kunbot.com/upload/files/71720379906.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/83788400427.pdfIn PDF document text
    • http://scarpatti.com/files/80466846060.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/lesuworusuzuw.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/xumanixun.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/wujoka.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/gikisegamaxigitokovuki.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/18834819619.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/75685657881.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/85943961851.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/2574391733.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd92eec329---kuzojuluwiwuwit.pdfIn PDF document text
    • https://tekmaker.com/upload/files/56603363202.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/95006545923.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/tozija.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/nopidezezevowasegidu.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/26648290188.pdfIn PDF document text
    • http://elitvorota.ru/f/file/26518980914.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e9676a7170784b1957f176fba006ed3c/bexasofakuzomi.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210920_200019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pc+building+simulator+free+download+androidPDF 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_off0000b183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB183 11148 bytes
SHA-256: 053693b459a95db93c1b2658244b7ee08a524c81dc4fbe9a9f08b9b8bcc2b001
font_01_sfnt_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 14904 bytes
SHA-256: 1c256534d7936e5fd519a6ab25b1f8262d59d818aca0b2d8e9ec5f7df50d629a

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