Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7081933169cf73…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 00:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 517fe0dd2d5b444863f0b9d6bded00c0 SHA-1: faae98bf38b63b62ce911847fd6f93801dfb7271 SHA-256: fa7081933169cf73e70b01f6a79944e0f082d76c580532505ef846292fae56cd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites and disposable domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://01host.ru/userfiles/files/96966974618.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0dfc1d16---babetovonuweruzez.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d01c974b856---13486046676.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/46844174631.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a04e2333---85098837332.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/68103543407.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/josisejoxivegezi.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/13326352387.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870a03d41ea---25513300900.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f8e66ef08bd04a5da132807aab5da135/jinidadanonesawarepi.pdfIn PDF document text
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/waluviwululo.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wozinitarenez.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/nugunatedofevodavelegofon.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/28588887153.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f345cd843---49854223339.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2ab5f6c4390567660f0eddb108d41f60/52096427035.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/20972729825.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/11442651884.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dadobovozipusa.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/286285480.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/8a04ebfbdea6e0c4876aee54c9a439bf/pojubaxurejizuwivuramavar.pdfIn PDF document text
    • http://chinazzjx.com/d/files/80030716085.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/26189735336.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lodixovamejavedapud.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/cdt1m953bchbpse7ikp3b8d5nj/23414820847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=shed+plans+12x20+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_off0000c46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46C 16820 bytes
SHA-256: c7cd03442b2a7d82aa225563e6472f40329f025181ebc40a4c7d685eab809bf1
font_01_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 10656 bytes
SHA-256: 7e4f12ed0f995ce8f9c52d2cbb9542053666a003ce821e3799986a6f0fd06059
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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