Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fa693f29471752…

MALICIOUS

PDF

99.0 KB Created: 2021-10-19 17:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a180d84ca5f791a05b25e4962fba6200 SHA-1: 4d7eda19479a0ad719e6236e7d4192b295ffe3a1 SHA-256: b2fa693f29471752447721bf3e0c24be43db1a655efa5d5973ce01b0767755ac
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://semagro-msw.ru/pics/images/file/29816880906.pdf In PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/worikevamefaxeduv.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/mikatisuxubu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb7c150a6---gulaguwugililokeponiri.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/rugipi.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/51265954957.pdfIn PDF document text
    • http://xprchemical.com/upload/files/240446547.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/96570403796.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021927656126777.pdfIn PDF document text
    • https://blogsma.com/files/31833227801.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/rapubawita.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd36bacb3---razaroladobekodoro.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/91138022669.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145ac7c22371---naxebosex.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/xutaro.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/dadajetazadege.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/34134372990.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/nebiwitokugofoseso.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/xogusixumap.pdfIn PDF document text
    • http://lachina.cn/upload/file/mezoxivuvazusojepumupe.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/xebogutijepeforawowimudi.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/terilenuxutuxalu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156544a8bbbf---nuwanezom.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=k%C4%B1ymetli+evrak+hukuku+s%C4%B1nav+sorular%C4%B1PDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/viwukuloruviraga.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_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 18552 bytes
SHA-256: 3b07c0a4da2684ea9b1846133960cd0a477b8d646cd22e916afe269d3c749222
font_01_sfnt_off00014ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA5 10780 bytes
SHA-256: 367b6270a7585333b6d59a3368e32491527a21a29b9fad404057b67dc1831de7
font_02_sfnt_off0001643b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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