Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7392c2a13fcbfbe…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 00:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e75ca4677c0cff37a9080110e84f3e9 SHA-1: 706ada0d05668b05e48b96b362b75247b1ffd9c7 SHA-256: d7392c2a13fcbfbec22dfee8da9f257fa67d544ec749b87b11d7915520a42b9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=doterra+oils+for+dogs+pdf PDF link annotation
    • http://drentmedischadvies.nl/uploads/files/78256989950.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/bewitosiza.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad6441a6b---39866232365.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/69879540690.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/c3qobp636lsgftlfn7k6f56tv7/buxisejagewad.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077b51fc1254---35224869023.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/9e58b7da42f3902ede810063dd977c44/xuselanavatokiduwefakaw.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa589f032---93825884424.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/zidutikevisisutifiluroj.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/18037133469.pdfIn PDF document text
    • http://newshop.jp/archive/file/89323770475.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16110921a53d99---vedejowawikonaxoresox.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/gunamilavudawisitoti.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/nexumekobuzozavuma.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/72451021273.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/deviterisejutajorewanesat.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/19204211204.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/maramedeno.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/46938776401.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/99444087133.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/vafejiwejo.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/2916188294.pdfIn PDF document text
    • http://sbcnepal.com/images/file/dupaxozanuwamimaludufeton.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_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 10568 bytes
SHA-256: 2b80f867d73174305ba7fff9612ab11f4d508270ed720ea6caa7e103168a6da6
font_01_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 18512 bytes
SHA-256: bce8e7a19b38d24a0669cbb5947a147671dffc47cc9afc5bfd071b65025080e3
font_02_sfnt_off00013b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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