Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a28fc099c3f663d…

MALICIOUS

PDF

100.3 KB Created: 2021-07-27 18:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: abb1c452f2b8a7a1ab2ea20f68486b04 SHA-1: 00b0adc40c530b1e4584db82b67210ee6202d1e5 SHA-256: 2a28fc099c3f663d4ef02d90f142e5a36715bfe02f5a57f2345b9ca18a8b4749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external PDF files hosted on compromised WordPress sites and disposable domains. The presence of numerous links and the use of compromised infrastructure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://machinex-machines.com/UserFiles/File/89137255549.pdf In PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/ketugivifoforudi.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/fujarimetos.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/koguraxixudipixewipijom.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/633c95e5a63aa6a4788eb699361ee202/fivofaruliwewosifapile.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tl06lgjaiij8kb1ufci6ua95l3/bipufafot.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/83208295484.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tjktdarj0018c9svdld4mn6qc6/burivopam.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0ac21bf2989897164ae55be5c987c35c/zijoxupuvanofugoxuxafufen.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/nimojadodemixibowuguvuze.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7628258c8---jukosajite.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zititisesevimirivufar.pdfIn PDF document text
    • http://stonebreaker.at/jipebegazufugabeta.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4cc24aad52204ae2ff8fde188efcf7b0/79363106823.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/rlrh0jqtae9q77ji9p4f7ccbgg/wuvemujulonejari.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0b361b9434dc76647ead778ce59d9f3d/dojedetuxi.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/kuvujudisana.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65e35f33c---79141442515.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b280b849---nafapamatowivozuwapujitop.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/xawitup.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/21535250594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=frontiers+of+electronic+commerce+pdf+downloadPDF 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_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 17252 bytes
SHA-256: c4ff45936fd9568ff102e9948d3acc83555f17c19f0ac7de0d36d9c0822fd8db
font_02_sfnt_off00016a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A2E 10844 bytes
SHA-256: 802bb7d6e768ea52a4d2b8305110f3d98446251c73e36128d28c9631ef8d9235

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