Malicious PDF — malware analysis report

Static analysis result for SHA-256 220820d56cf4f76e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 08:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f0af2e4b23e498cb9c28fc24eff83fd6 SHA-1: 1749e74b61cfe76a4566de1ae8c452d1e7d488d8 SHA-256: 220820d56cf4f76eef4810ace3e177fa3472877e865869394a233b18cefcd344
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e4db6bbfb5c---bemufibeloso.pdf In PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/82624034539.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/222tgj2g0lfl8vdrgcnkrr2k1c/91688584006.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/84764271365.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/be6f1d9bacfd7d27c49d94ab58722f07/nezuribamiwexa.pdfIn PDF document text
    • http://ausafe.net/images/art/files/90656313009.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588328093c---36481523190.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/tpld8r5csposl5414g0apu6upc/kenewumesesobewumefoxozu.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070121110270554.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/28415586700.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/zigej.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/xefekefakoso.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/45892185654.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/67866628428.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da18314b5aa---24356634390.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210731210440167.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/segaxinezimax.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/neziz.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/divamasobakuvojejuvor.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/fea0a2909fdced229dd5c2ebfdb2939f/lemabopilatuvurek.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d671c0c150a50de820d0a9bde1e40ae9/buvemepof.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fezaxozezigezadeze.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50b212df15---25725696374.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c9237f032---perevogomitelasofepir.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/frv8368qacm3h8i92pgpjg2h2g/10169965706.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/tukafipunifexuzeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pickwick+papers+pdfPDF 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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 10424 bytes
SHA-256: 739a603ac9299d18626a011ffb7a70458df19f2579fea3bd1ebc4d7d001fa340
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 18804 bytes
SHA-256: 5209e3711f3ff3b2e70cea1466f986d3059c1a9fa1decab447b5f26c7ef60d97
font_02_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1