Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33a880d10c31a48…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 20:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbca788c48a42bb6117270d545295e2b SHA-1: c12cb1ad5c41bb631d57720c62552b4711e8330b SHA-256: b33a880d10c31a483462ee03007491611c73414c3f7aa98fca2b83eb6c490064
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nudazedotazugebu.pdf In PDF document text
    • http://bbfederico2.net/userfiles/file/47395748230.pdfIn PDF document text
    • https://novsport.com/content/File/ditidavixej.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410de11cd11---penasisobisakupata.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/fodosujolivir.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410952a8bd1---jomulexabegik.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/42f2f4502b3b23c63833079ab0006ba6/nijapowox.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/kupexaxuzakikanawojobipab.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/6784107596.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_052825.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/kiwizozajo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1bdabae9---41886340406.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/siwamufepa.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/ferudeba.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/50442642989.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ad06accdd---37885823817.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/77798740096.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614040914f3ca---74285377582.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/17718965161326a4a7a136.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/42358227452.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/3105595299.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a6101dac2200b84e3477a35eb889f69c/jepul.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/79593513304.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/puzasejivef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=make+gboard+biggerPDF 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_off0000ba6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6E 15916 bytes
SHA-256: 42d764d435cfbce1ae28e3befa31a890a5ce897ac7e92118d3409ca6d37ca04a
font_01_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 10232 bytes
SHA-256: 20795a4e7abcf58049abb2005254180e412844adb0b55506b299e6c9d0e80cab
font_02_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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