Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b69ed37e7e83fe…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 07:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2e29f4d97482935f535213ca09409cb SHA-1: a81baeedc1797e528aa3f5be0725ad95a013f4a7 SHA-256: 35b69ed37e7e83fed6d8ba0671e22329ee6d5051ff0b1580e0fab0bc08582c6b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The presence of 'utm_term_redirector=True' suggests an attempt at SEO manipulation or phishing by disguising the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://hoteldarim.ir/basefile/hoteldarimir/files/beluvexonewivo.pdf In PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/66086371503.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/89051801934.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609093d9627fb---62776034020.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/tuxejomu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/juvubikogojafekupibugegu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/68136238029.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/p3rdualqidrsu93jm2eir24uf1/dapofinebunozofe.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934cf5e38ce---vuvaroxifopa.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/28b4b5207abaa4710239a4d7eed40a7e/pinitexewovozezenipuwi.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///vikalimotumel.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852c25acf2e---pitebitij.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a404f4488ac---98313454995.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/67250274545.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a024a3284da---fabud.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/67986219367.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de8778c57---tamuwebetupum.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0022c286e---27414571358.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160769dd0eba27---3206707776.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/mixinisolumoreniri.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wuzovule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=andrew+gordon+modern+history+of+japan+pdfPDF link annotation
    • 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_off0000bf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 16988 bytes
SHA-256: 9f0ae5b29cc3532cb3682ac2562fee169df2ad755538cce41fd23139811e8ba4
font_02_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 11212 bytes
SHA-256: 0823d10a79407e7388d0488094bdbb0e97c9563165765ffa6b10f4447c4e0069

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