Malicious PDF — malware analysis report

Static analysis result for SHA-256 833a293fb95c7654…

MALICIOUS

PDF

85.1 KB Created: 2021-08-25 18:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26addf03baae6ec9eb366c1f68d1eabd SHA-1: ac1e4234db0d851a0f1ff7e0dc43785bd2c89342 SHA-256: 833a293fb95c76544486a11af0b0f5b5e1b71b0da3e8b7eddc8eaa157b54f294
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://parc-hotel.info/file/36899409025.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608889c222d53---repazepawadeferon.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gs1qi7p70o9v0lefhek08rhg72/24982072029.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/pejejajumevute.pdfPDF link annotation
    • http://28777886.com/Lpf/UPFILE/userfiles/files/rojido.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/90433690091.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16123a1cf09a2f---paxexodezopemukikijip.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/43013189079.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089253cbc710---14160947092.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d60bcb49c2---vijomo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608685b4af660---40000580472.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d2edf37995c---xuzoxiwotixexosibiguseta.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2383f4040d---16384811998.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5e9f2bde---77614978016.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1bf2f2e6f44fcdb25eb654af63522a38/48147442431.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/trgfphm5v34orqcvqsros5d0l5/pogadederevivemixej.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdafa69a0d---77874753508.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3702a4563497ef358aa0294e450a4879/xazovoruviratixe.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/tibef.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2af35a830---zogavironipav.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8ca1e929---35369026827.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab79aecab3f---zodexefewe.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/rakabumakizaduvupixisila.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baec9dd692b---vatunazisazu.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/nudopiwegamobawenufonab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ny+drivers+license+id+numberPDF 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_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 16556 bytes
SHA-256: 7f683490a360fff9e84f5242c9c228a9f50f54a6e067bc961ecefe2c64cfbedd
font_01_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC8 10548 bytes
SHA-256: db801268a167312e687259459d831af6139a65284598ed8db0a057439ef268d7

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