Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b246c925fd4276…

MALICIOUS

PDF

87.9 KB Created: 2021-08-05 17:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ca979a3154a02715d43f9c1ba8d19033 SHA-1: 4120faee1a8eaaa0b5e90ca78777d8c598884620 SHA-256: 17b246c925fd4276a2dbd5d3538f16a5dd7188e385d2284a87adaf04f08f6a8b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to exploit users through deceptive links, potentially leading to further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=how+to+know+if+right+triangles+are+similar PDF link annotation
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/649a168940468d11e065457c12cde1b7/62814490760.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/44095037531.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/pokununavaporulozarumad.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/rowotujajusarokufebeka.pdfIn PDF document text
    • https://isosklo.cz/uploads/90362469034.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/06ss78uu549iudqm6uqlkaa5f4/fiwisuvekete.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kinadosizibe.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ac73ce7e---loletabunutogubu.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e0d57d5227fd2a6c01393d82977ad22c/joboxo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9389ad045---zijokikigekusojixunago.pdfIn PDF document text
    • http://jfe.hk/userfiles/komeredawirijekixug.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/89341040498.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429120128169.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/40622484644.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b314014fefb---gufafe.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca2893d7d---nukowofagomaxul.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c14036b168b2fbf74333c04ef1a72ae6/95054454443.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081e681d8170---56530797508.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/67576951320.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/f9r42j78jqvpjpeocbqjeqp7dp/51168333650.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f09fe53aaff---bakubakewajojexubeke.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b75963de3---veforetu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b054c2631ec---80945414188.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a9d12d77---30796441314.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/jodotifojujomameperemu.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/49912319370.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 17716 bytes
SHA-256: 04f74f8c339feab6b5a60522b321bfaffc165086387f5d6edcabc045922a9bc0
font_01_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 10832 bytes
SHA-256: 8d9f0bcc55522c8d27e5a775b38e5cbfe5e4cb062a39b5c9e7761cd0bf5bed63
font_02_sfnt_off0001372c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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