Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6df9fc03df8524…

MALICIOUS

PDF

121.8 KB Created: 2021-06-25 13:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b7843f8f12812882290f8697f89b3f60 SHA-1: 1f4be7772c295580925739979f75e9a3cec9876a SHA-256: 3e6df9fc03df8524f0f17a9289a646cd09f057abe5cb20010b8c9e996103cd27
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, specifically targeting file upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or conduct phishing. The presence of numerous links to disposable hosting and compromised CMS uploads suggests a campaign focused on distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe30be096---17607547308.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/rularobetijijovepumeka.pdfIn PDF document text
    • http://sy-smile.com/upload/files/nodemarifodopini.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3ec99322---lulajofo.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/pitofuxusekoveg.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ia7rp21od3cvmcb2vbd3nhceff/17843704412.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ch8o775c2g2j7cmg7fh706c5n6/widugipipabi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0738640cd8---jamiwipedapurer.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071753c11aba---27740921667.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd72ab433c---41255370136.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/bavibusago.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/74ee26339132f81b58dd2afc5e12fc7c/lovojoj.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f382dbc9b---zijudewivowodutekobudat.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/99807843161.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/vupuzoxebupivopomabakuvom.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080acce78809---radog.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f0dc125bcde89e8c8ce83af15a6f4c96/68688287007.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43e49d7ef2---faxosoverokifor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=d+and+j+home+and+hearthPDF 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_off00017ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC7 17784 bytes
SHA-256: 6a7d107a8828ebc5620e580cc8f8456c14971610403debbf2bca6b09d3005d08
font_01_sfnt_off0001a94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A94C 10336 bytes
SHA-256: e7331ec136aa55cf2d155fe4acd24ca4575356d432a5695ec132da1fdce89863
font_02_sfnt_off0001c063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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