Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac319692052eed4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 14:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6824b9270cb369b11a3397166eae629 SHA-1: 87fcc14c22e2cc77d3f394289461f1e42f133c0d SHA-256: 7ac319692052eed4be5b4257db5094e9c8106117ae992efc6a84f8d87d09b0ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on disposable hosting, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=straighten+out+scanned+pdf PDF link annotation
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/h19vn01j52gkr4ird1ova0e3v5/89014541595.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0888333a9f90ab300c20f049b073fc26/29078006071.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/558458dd00a6eeab9eabadec1046337a/fulebadoluv.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af99130c0a2---gipilulupusutewomal.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/156050bfc1912796fc2a591647357182/48386519356.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/af71764f8bd9adf1c0eed6898e4b00bb/sovakot.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d69b2beb7---dajefadarolupevujupu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a1c74871e6f7e80253e89671f72f993c/48362715019.pdfIn PDF document text
    • http://szm.hu/userfiles/file/rufukamedaviwujubere.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/laluvixokemewonizab.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/h62brh5ksleo8ho4vhck6solu6/jijupitisikopagonidejufas.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/73966335703.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/7086869151.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/23456194294.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/banalanavuwubetijogax.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/lijabenepo.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/25819156779.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160889fa45bc1e---wuverazes.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/21809923095.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/83234754722.pdfIn PDF document text
    • https://anjingliar.com/contents//files/wofijixepulodesobovisi.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/33802277798.pdfIn PDF document text
    • 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_off0000c3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E6 16664 bytes
SHA-256: 2779f08e4786623ab4069cb35652a113831ebb3e48c844bce3d15471b62e82ff
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 11028 bytes
SHA-256: b6add5ddbb01ed396348e2369bde0d364b66aca81006840ac6d3e98e08c020ab

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