Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b95933e3958edd…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 22:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f88185c34ea476ac17e3f6a4d244b9fb SHA-1: 5478a05f23bce0703910fe3095829b70b9f2726c SHA-256: b9b95933e3958edd59921cddf0fc28efa5a88ba002828cd490026022c52ec504
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests the document's purpose is to distribute malicious content or phish users by leveraging these compromised or disposable sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=what+can+you+do+with+bamboo+minecraft PDF link annotation
    • http://humidorio.de/ckfinder/userfiles/files/najexaxogebofegilaraxov.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/gefubegasipavapas.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/jusexokimaxulajivisapuref.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07e1ae311---fobalurilunometelosod.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11902620274.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/xotoxire.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155c6dabf758---dewamowurirojimudumisadew.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/95969077509.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/54121200625.pdfIn PDF document text
    • http://altus.pl/userfiles/file/gebus.pdfIn PDF document text
    • https://alohasafaris.com/files/21148416645.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/84563160424.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/depenexejasuwolil.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/39530533230.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b2dccd5bfae7e6330a354f969b9281bc/pejolavupofixubaboginak.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbc4d50e6---tomiboj.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/dubazojoravi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16146562c9c657---javedotixen.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/jotuwodonadutaka.pdfIn PDF document text
    • https://ibextrail.com/editor-images/wubebisosoge.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/9184681584.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210928180404.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/fesivoxoga.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_off0000b2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FA 10960 bytes
SHA-256: 5981657b14322b8235c87b0b575fdb06739c3a69a5fb12c4a20a8e9162ec45c5
font_01_sfnt_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 17060 bytes
SHA-256: 928c6e86fafa24ec4a744478c16e901714d05d425a18bb9abe5d01e3a36bae6d

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