Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1ecb0b59e86877…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 06:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 82efa7c21a59413120d27e2055bf5c69 SHA-1: 740e1914fb6b14b731b074fcb9666988b27dfaed SHA-256: 7d1ecb0b59e868778a4d8f90c750ab3e092c14f55b757254f92b38a5d7b5f0a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=farmacologia+de+los+aines+pdf PDF link annotation
    • https://living-stone.lu/userfiles/files/62929669850.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/11896181005.pdfIn PDF document text
    • http://teakdeck.pl/files/file/95450686741.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0d3c4e1d---89567698898.pdfIn PDF document text
    • https://redac.ch/upload/vawajiwuwafozug.pdfIn PDF document text
    • https://tisuputih.com/contents//files/85132998991.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/i5algm2pbig3lkdhsog679uf6c/15375051981.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210715184701.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3cb02696357a312e782dc3bc94b281a1/fofogetizugosibenikob.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/42624504650.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100d427b6e5d---62087327536.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061904454666.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zupod.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4bc910e8749166d498e1ecc2576428d/71796039349.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7bc6eefa7bd98095b48bbc216855a06d/30236383518.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776563d5259---45597268308.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o3id6dclpc1knu937tlrnhecf0/43587358967.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/84853a1129f96a1401cfd79605a4d77b/jilepupiserinemad.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/biripa.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/bejipenakobimiregav.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/jarekobi.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/2c8720943ab1869ef2309af89ea8acaa/80129213167.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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 10840 bytes
SHA-256: cb6e645b1bfabbe215a0652929757c89315d21ee12bbf4b13bb6b7dc6076133d
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 19024 bytes
SHA-256: 2d95070dbea663c7eb2001b7d95d6da4c7539f36ab2240661ed517df079e28a6
font_02_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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