Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dce11915dbd762a…

MALICIOUS

PDF

71.5 KB Created: 2021-08-28 07:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8d7d0051cf68c304d2eba55f6f2c70b7 SHA-1: 542f0085f6112b5cb951d232f03fe9ca25a5f812 SHA-256: 9dce11915dbd762aeb7dc488cbc62ee91334046487a930a3d654f7248a17a7db
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 0.9991

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f601f43a5d9272267b90e179d3f33caf/781959579.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/fagotugo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d02894a946ab4a75817a39b264f5370b/kesiniwovidi.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/dadozuzefiginepazev.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/nak60c4fel9ku1ku85i9bt0jle/22367443701.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27e913024---40780669279.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/74349326817.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/3c9f5e7052388c6e2e274d8f7d0f3fce/nitiloxexoposumosedipamo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6e4f81251b60e391e9a4864239346117/xavosufujovodotutexare.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/s7eprl8s66tfj0jqtcq3di3i80/kitawemoxupusojipu.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/68318327897.pdfIn PDF document text
    • http://email-database.info/userfiles/file/zofikuwolexaxoxejivim.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/48336763758.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/35624400258.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160773fea534fe---zagegevobajogive.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/12119c589aa89a700c10b97754eaf7d3/selabedolub.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/10602120678.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e2397877---ferun.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/wowimozutivoz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l97meadmut66leinugfjncsf15/18867114908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=electric+home+and+farm+authorityPDF 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_off0000b8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 10772 bytes
SHA-256: e49afe15317971e8dad7d1d95a2ea70ee47d7869112556d90f87918cd546b73c
font_01_sfnt_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 15508 bytes
SHA-256: 39f9921e6ba5ac67b975f3caf649f7dabd461c9ce0df71cd5f73d1f23f5851c6
font_02_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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