Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b645ebd83bb58b8…

MALICIOUS

PDF

82.6 KB Created: 2021-06-15 20:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 736becf15b82f238f2e3c2e3028eafdd SHA-1: 62126855b279086130ca0797fd617e07c0083b50 SHA-256: 7b645ebd83bb58b8bb8a20f1219348cbb2eaae842c7dc022c5d8af9768859c64
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=la+bella+durmiente+en+ingles+pdf PDF link annotation
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9d37e92a26bf004ff355f3407128de77/49599477441.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/60146418390.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947d0cf8eb---dipubafazokezeram.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cda89f6cda9e5cd86cc3b45b77d2abcd/95442608348.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/s6c7hspbhh0pm6g22o1n0jou56/40560607948.pdfIn PDF document text
    • http://szwygs.com/upload/59352288236.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/majugefog.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ad83354fe7675914d66043820ad09aef/sofegusidumefelopen.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/2730a9930e592d974bef800ff4a966c9/1667080573.pdfIn PDF document text
    • http://abpaluso.com/upload/file/35121315304.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa26d59a48---roxamagebiretejivoveniw.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/97790735896.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/vokidumemavazaxawebeluxu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66d4cbeeb4---7636573783.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b9bb333e---25818264810.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file/%5C/2021060513334841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 5444 bytes
SHA-256: c3058163ff8860996e67b66baf857e786530affa8f7f286ecb43c9dc2a024a7c
font_01_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 12140 bytes
SHA-256: 17c05a11288b6ecec33229972a3a24738d9a122fc377118e34eb1306256a6429