Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e35142918f495c8…

MALICIOUS

PDF

95.5 KB Created: 2021-10-07 00:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e261348606fe78232fdf0535b6cc8a4b SHA-1: f82821606c71b66d7be7cccc9c6893539dc53ef5 SHA-256: 7e35142918f495c80bed71d0dc3d1b5874d5f3b65b56a0585ff3326567d156c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=tamil+movies+2017+free+download PDF link annotation
    • https://castilloexterior.net/ckfinder/userfiles/files/43756050900.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/21812153317.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/250347484215.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/79051833413.pdfIn PDF document text
    • https://dm288.rs/slicice/file/17973470164.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804213533c---jasozilitewanasilokur.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614118d92661a---87895115632.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/nurerarubewuvi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c22085f86---fopozubezakitopumaxogik.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/74236311442.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/64369235359.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/50573186176.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/wogor.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/90700046745.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/63781168781.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/dubibelomogoseruvibas.pdfIn PDF document text
    • http://eternoohydro.com/d/files/mesedoxen.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/nodowivonutujekegazegewep.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/vijexowibomepifurijobagur.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/nerodukavozajitakenuxax.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/32519215154.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f804cc10f9---65634152772.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/kiwodumegoxuzozejalodat.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/xudidapegugasaxebukox.pdfIn PDF document text
    • http://svx.su/ffile/file/bebiga.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_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 10876 bytes
SHA-256: 531ec2cc6800cf9d63d4732666c410dfc2f06821ee4a7de304fdd00c681244a8
font_02_sfnt_off000139fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 20552 bytes
SHA-256: 123a9239719c7037618c3e5857352a6aaaf5178796affc2cbf142741e5ecd545

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