Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f4efedd0a7f667…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 18:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afbed7c23dff8fc86104590fb8b51c2b SHA-1: 1544bdc4be33fc183e705a0f63956f515b53e7c9 SHA-256: b7f4efedd0a7f667805ea02b0c21a7e007baba5f5d56c07cca4bf23b0c4272fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farm heuristics indicates a clear intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=netgear+n300+wifi+range+extender+manual PDF link annotation
    • https://askisan.com/upload/ckfinder/files/77078235136.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc5ab16bb2f---bozobigewemosefo.pdfIn PDF document text
    • http://scro.ru/pic/file/50786588843.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9507023f45---84926599497.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210508223135.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d266c2a243---92787218503.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/13906084375.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/73473160738.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/kepubalaf.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132abab43ee7---kojozilibexenewete.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/87156019728.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/zigefarujikavunevamog.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/33184312321.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/livurax.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/vimonugisigozalogitezem.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/64d56fdfbce1cd44820e1cc0e7bcffa5/99940531461.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e6cf4065a8ca377223b78a5cddb24e62/47592251876.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/55754440851.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/zatazemujejerasajukoxo.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/totokitipupaxutedumenemof.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/93eb03cbbc30c1e27ebd1e2c80f08b52/8064485036.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e784393e---43474174381.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1dhintnqn6ij2ed2cupsaep7l5/borupodoror.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9a5484c3---magexojufewiji.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/62802996789.pdfIn 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://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_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 10968 bytes
SHA-256: 8a308807f5dcd1625e61785fef0d48750eaf3361799534a4163206ec521ff3e1
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16848 bytes
SHA-256: a0b44987cd7fa24975ec272bf184ad2a002833ce5f89ad47a37206ce74504908
font_02_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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