Malicious PDF — malware analysis report

Static analysis result for SHA-256 df47d1f20eaad217…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 13:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b73ddfe74ad909b2043f954b42a7991 SHA-1: bd083fccb59e9a90c6bbe1b4ad285dc700a2bfc1 SHA-256: df47d1f20eaad217d90879dd768ccba418c4be628695a549fdd7a150e02c9f7d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple distinct hosts and a high number of links per host further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075184ecc68b---25669783214.pdf In PDF document text
    • http://mail-ex.net/userfiles/file/57541137893.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/10365782096.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c2b7232a---69565225655.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e15da4384---zikav.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/xenotonosuvageguxu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc9b740f6---63296175052.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e0521bea1ec29199e0ba644939bb1c23/zivikelejivosefujofakab.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad000ea7b9---zaxipamezozirotigofewiju.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/datanupa.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac005bec504---67525030463.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16072a08b88b94---6128533130.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/d6b03bd18652a14a828768ff5ec6616e/ziremi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a470d0ef7a6---71273012071.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/65787399106.pdfIn PDF document text
    • https://area5srl.it/file/18995893267.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/37aasegqpg5k7jb91b66f988q4/zujudagidilal.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/31674842617.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161132cd2ccbde---vegidero.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/vafomunupumagiragaxiwil.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a276f2fde6---woxitufewelebujefevo.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-18/20210618034248932986.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/27428944620.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/vepenaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=answers+to+vocabulary+workshop+level+d+unit+3PDF 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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 19840 bytes
SHA-256: 251f17b593f043b7aab6daf57836c0130c93d14692fee0ca467bf58a1714e594
font_02_sfnt_off00012d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 11360 bytes
SHA-256: e4afad9219c2e344dd9e6708be325119e2d9eb561f3e6be39ff9a857de7b87d0

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