Malicious PDF — malware analysis report

Static analysis result for SHA-256 275988e55548eb66…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 18:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bd73ff9a39918b97d20fdf7dcd2bc9f SHA-1: 4f46e14af5051bc322b970e501b20c52efbf6848 SHA-256: 275988e55548eb6656a12cdb51ee633e309dc27e9ec0342871093febab4f8c68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of embedded JavaScript indicates potential for further exploitation beyond simply linking to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://drafthe.ru/uplcv?utm_term=crop+all+pdf+pages PDF link annotation
    • http://hitecds.com/userfiles/file/jakajevapuxujuguzinopugi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d69bed27---dukidelegopidoxodolujorok.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6cec9c09---60436155273.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/481793958.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/32533981870.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/21198540327.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/74295750874.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5937efac253f0dd8769e33cf578fbe23/14982606572.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cjagntsi3lnb4ktvet54293m2n/maronexavesitivutapag.pdfIn PDF document text
    • http://olympusflights.com/files/files/zefusin.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/93145973273.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/21879287422.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/jigugulumizof.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fcb365f133c811fda32dbeee62b3ccc1/fafefavapiwogepesixu.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/tozematufomosuguvitif.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/75308394299.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/gitujetipilelixofilefone.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/mowikobuzexewuw.pdfIn PDF document text
    • http://timebymtm.com/upload/files/12548922836.pdfIn PDF document text
    • https://razredna-nastava.net/files/jejoretesijolomeri.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/26084524454.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/dapusuwowupiredaz.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/kaxirexi.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/9131978672.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/redap.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/9139249838.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/wekopamu.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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 16776 bytes
SHA-256: 22d085085ad6393a89f06bb465400fa977cac8315509f1cd8e92b4cdf1657af0
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 10408 bytes
SHA-256: 3ed9b3e5f45ea760a0df415475ba2971761224696dd4493cc33cac037aa2649e

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