Malicious PDF — malware analysis report

Static analysis result for SHA-256 800b4109bf696d56…

MALICIOUS

PDF

69.6 KB Created: 2021-09-06 21:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 872ca86e450125546df0c366e7bad512 SHA-1: cb31e9be1d0bc4cee549f8963b489fa79c4fb527 SHA-256: 800b4109bf696d56a3af029804fb24c4d47e36ee9e25d02205369581a648d1af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external PDF files, some hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution scheme, likely intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://implant-drill.com/userfiles/file/66022647088.pdf In PDF document text
    • http://machinegroup.ru/img/outer/files/zijasodal.pdfIn PDF document text
    • https://area5srl.it/file/sakubibelagepuk.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/7202115232.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96843a8eac---jimagozowosinole.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ke9qappdbar22gvqctb5mchd3g/pemefidufupudefagif.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/6651515922.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9f55061c4e803851c24253e821a1902a/99719291203.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/acaa4f773e419d1a2d573ac07e2007a1/gebuwoz.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hlsfoigf441vavcr8ku6h78dvu/13774274742.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kosisalujajetovajuw.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zufalokuzo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e51ee0d6---29904270983.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/46242564502.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1kslka983fkeu4k9cto5031jul/pesixevel.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/tuvijax.pdfIn PDF document text
    • http://maclashoes.it/file/42974917655.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9f99cfa40bd6232075e4498a9e295a27/wutenamovotolelevaropuma.pdfIn PDF document text
    • http://tochuchoinghi.org/files/zakesopawerobusoduli.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/15442950921.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/dopopivemazemiminor.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c314a230eac---13801095280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=diegetic+and+nondiegetic+sound+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_off0000b041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 10752 bytes
SHA-256: d663849ff0d2817d737cc1e73ba3ce973a5a12c79010a10b91ad411552624b46
font_02_sfnt_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 15856 bytes
SHA-256: 3ab5f3380a18c6eb4c1a551a530a27efc9b3291380ad0a55c6407294559f05d8

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