Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cc0c795233ad35…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 06:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa0e57d9683956df2c9756e3741d0f8d SHA-1: de3a0a3e9beb058094fb76e90e985309d0b97a59 SHA-256: e0cc0c795233ad358f6d7978174561b3edee53d998409fc9dbd102e907f2cef9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ijdssymposium.eu/upload/86090812566.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c891130d97---68416156140.pdfIn PDF document text
    • https://arendic.cl/files/xezopoleladijefop.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/acdd4d7f7bd44584cf42fdba5635eb36/xezurasetut.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/nekobinisukok.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/fizogoburapexobe.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/42120449895.pdfIn PDF document text
    • https://kopari.hu/files/file/434284333.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/62518752099.pdfIn PDF document text
    • https://angkalaris.com/contents/files/14763953937.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e96lfsj886il2efbdnrerjool8/4718514968.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/rovonejawesabevuver.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/xudotujupinon.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7jmndacof37ni7plbhj989f3n2/xodogegufin.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/dpulu29rpc98bq8hfsa9m1m8bk/7662172824.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/81971518840.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbead123a3---91577788001.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f4333384e---73225446117.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/700aiiu8bn02ku7pe8mleekfa5/33323858239.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/punez.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/114fd88db62138bf336ab90c9a129908/kutawazanupika.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160911251d2586---pesufitawaxirogula.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wibafegovosefe.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/23600728815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=delhi+police+syllabus+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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 17832 bytes
SHA-256: 26d7479bb063f420ab88156808fdb9d8abe8c1c252c965163ee0adc97a31ab67
font_01_sfnt_off00011be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 10768 bytes
SHA-256: 747e96de9376a92e8305b79ef2028e842e3563a8c72bc7b31eb03e3e536f090e
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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