Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbd09d51ce24556…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 06:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f15923b11aac823bf95f537be0ca0deb SHA-1: 16dfd6340a66d8c6f304b40eb56e0e76e59aa69e SHA-256: efbd09d51ce24556df5471c4eab95ffb27e16d7138a43ec7723127bcad892628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/sesogabevavani.pdf In PDF document text
    • https://linhquan-group.com/upload/ck/files/radonelugupubebugi.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/88801678153.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/pomuxukuwamibetevetepup.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/178a0fb94e3cbf05b58050283a589306/janigo.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/84452891209.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/lesamejinatasogufimelage.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/sujosomafaro.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/ruwoviroburiguriwigixil.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/fae35f27b534371ce2a489cba63feeed/towidiwidufevagizuwap.pdfIn PDF document text
    • http://www.siposferenc.hu/html/magasedajitup.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/50726751096.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/69174347418.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca357aec461---3679828796.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/646ff83363b2ccc263c7299e6a6ef357/47416048894.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430190712789964.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/dc6e8c8d10e731d3fe7a767a08dd8fa9/38298108118.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/47155583446.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160850176a458f---10896753994.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609680a1cd431---juxogemonek.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/113234202.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160872f12efacc---zapanarizivanir.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/51741273875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=content+validity+psychology+definitionPDF 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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 17184 bytes
SHA-256: b4176cc15651f0a143041b91497697a642575f7ce19315f21141c0bad1d7d366
font_02_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 11008 bytes
SHA-256: d66e29f0a967fe92251b6c7f9d242a58dc40cd93756104cf9958593221af82d9

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