Malicious PDF — malware analysis report

Static analysis result for SHA-256 101456b7fec94137…

MALICIOUS

PDF

97.1 KB Created: 2021-08-05 21:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28197354e81a075be22df09363cbbe7b SHA-1: c5200e240271c05d5ee6e3e87a7fa427f502aba8 SHA-256: 101456b7fec941377d85aae685bc9474ed65504501ec11e6fe22668b440f016f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a high likelihood of malicious intent, possibly involving the exploitation of PDF vulnerabilities or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=what+are+the+3+most+common+shapes+of+bacteria PDF link annotation
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3b8f05d5---xopulamodumuroxog.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/69216729806.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/bded290cb4e1c5c4fab57371ae04b6fd/72942272482.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/nalepabexiwikidex.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/875e32bc1c3990337743c434211f45b2/73552901560.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/26204900358.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce3bfdf706---84684106295.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/gawojunimoxikip.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/kmbkkk3qvhc6kiur5fvmhqs748/49607419611.pdfIn PDF document text
    • https://bloomeng.com/uploads/24944363885.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/41922916940.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1a9a987fc056dad60fe1a6b46d2de6ce/63239169143.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/87605581819.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c0f01869ca8b93afb379463ed4616573/8083148999.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54e54efba---joseludusepet.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f331b378---42336566450.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/84338039812.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/47353223192.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096f449b9b6a---18097959076.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/1e3a3e4b352d41ca95edd4b60566d503/8755857264.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/peruzure.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e8da769a03d47660ec6628337320dcaa/77980044379.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3ca8aafa---zalawateviwe.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/70070477056.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/42032398852.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pppbda83db37ukc3trp2bdivof/39894871642.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_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 11004 bytes
SHA-256: e5a5791224fcec5c0133220e681ac49c6a126ac59cab044a318416c6425c4e5f
font_01_sfnt_off00013180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14992 17012 bytes
SHA-256: f5a61b5a85be57fbc9c297927f90a95c36adc3b4b086a06e4e7894d0651edf2a

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