Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85ee2000e48abbf…

MALICIOUS

PDF

73.0 KB Created: 2021-07-20 12:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3db225819c2b719d1b9a23730e82dda5 SHA-1: 2ce0c9f09c28c5b45824fcdd171534c7e3bb58c7 SHA-256: a85ee2000e48abbf7db8eea6509e24e3272c5bbb60b3605f45e54d910a90c7a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are likely compromised WordPress sites used for hosting malicious PDFs. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious intent and potentially engage in SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb814054c---nevamilexofofusi.pdf In PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/delugerikunekesan.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/93039370642.pdfIn PDF document text
    • https://kar360.com/resimler/files/wugit.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/37423754018.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3111aba6c1f91d21dff1005d1b418e50/12772797007.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dblituc58um5inkb43hla8nk6c/99852212859.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd84f097583---97646602699.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/bowuvenodakaligal.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/78016006344.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607909b4b245c---94890837643.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/jijupoliki.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/92702275788.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/20672488589.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848cb109da8---kokotenekazogudakon.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d58d87341---94684697549.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/nimuwiwugufagad.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/00150ea339d6f0e5a627be0c048e1d31/vemiw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4503e0c2f---70237260398.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/cb04306b18a8b299fd9173e3740f07b3/sorolikikoxudawesuduzedow.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c7a160d1b6ac85c6394e948a156f1e03/ruvusolemusanogori.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/duwarukuserar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=happy+birthday+aahil+cake+imagesPDF 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_off0000b8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 16592 bytes
SHA-256: f77abe4f043226b4036f8009c0e89756d517df730c1e24756747bfd6fd453728
font_02_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 11072 bytes
SHA-256: eae31c1034f41a03317c0b9a7392358671691bd6b31d4d91ef6a7870d8f4e37d

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