Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b861a5edbb3476f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 11:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: beff99c57f86c37f65da5b0161301b48 SHA-1: a2a0cc01a87dcd3fbce12317164802a2b9fc0dec SHA-256: 7b861a5edbb3476f4db7fa439c94b3e0a1e6d45a8f5c7afe443625a182aaf485
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/kitojo.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/eef02d0727a72a53b710d470e21cd064/pudipevilelajinas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1939889564---sarifeka.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/simajunise.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd761e14b9e---70912866654.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b354baa56---16970362007.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075ceead69f5---perexobazuzugazabilovum.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/41536518084.pdfIn PDF document text
    • https://ibericadearmerias.com/file/jotebideraxuripi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec27c54638---kikat.pdfIn PDF document text
    • http://yejida.com/userfiles/file/90970698995.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/erltrmaqs93jq6l7fi2n96qpe6/deramowibaz.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9d74d86acd738092284d29597e25216f/93149972230.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8ehu2g1t8pgtj8s7554nl71j3h/dugarav.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/56867838011.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c61d25f2183---tikemawaxoserafobetanesu.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/wejulame.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/bokawadibapubuluzuvunaza.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/95852005652.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021627114623.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/68506031634.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/97860188013.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/rjnv987ndpsd7mgjclrfahn950/zopukeperesisomuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sword+art+online+progressive+light+novel+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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 11004 bytes
SHA-256: 33139a70ecac4ffc4e9353ab9e75dd78d46074dd9a11d836acb97b89e2785ac8
font_01_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 21116 bytes
SHA-256: 364c12552b52d1a372fdb6bdee95852822122462212ab8157d9700b5abced381
font_02_sfnt_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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