Malicious PDF — malware analysis report

Static analysis result for SHA-256 6758448cc73bdbca…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 04:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c85f643fbc91887053ccd9a9e5977c5 SHA-1: 9a21333fdabb9b39f65c342b5903cda7d7945cc7 SHA-256: 6758448cc73bdbcae3472c35c95bc7fcd2f7571be2284cc4117a313739ae84a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the overall structure suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4rgq1gri8236dpebgsp713ttd6/35352877626.pdf In PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/49116724808.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/33298507225.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608640cd24462---69025176505.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca65dae816---mobatojoxuxeweliwofij.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/92688287158.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/68661695416.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/27613770794.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/degipi.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/88403458529.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/69270806546.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/96534302733.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb40e0f48---34184955711.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612be8cacf55e---15477905926.pdfIn PDF document text
    • https://unosms.us/userfiles/file/fomupabibeberigis.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d40d1870d8a230387826c10374d82cc0/96156182643.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/f6tia8gtfpl7vkpf4kmv7rhke3/85393409761.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/44958299357.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/79404529333.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/jupip.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a1fe2e717d0cf05b55a75a8669aae9a1/wasijobupanasusuvi.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/29090819703.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/55724465100.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/zavoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2007+suzuki+boulevard+m109r+owners+manual+pdfPDF 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_off0000ce85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 18176 bytes
SHA-256: 6fed087b44ac140dfeab84499b0366c53862980f55203a64742e7ad98f7c2ab6
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 11520 bytes
SHA-256: 5c534fabbb9dc7762e1b5c0cad081edf7617cfa467b1b7a8bcb381ed227f4093

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