Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48118271204dea7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 17:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85790a9b0c00fdf2b268f5b70672700b SHA-1: cce403204870dd3aead71dac32e8d0bcfdc0795a SHA-256: d48118271204dea7c0dd1289a74fab1833848c8dc5978408b5e17093ed149d92
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f825fc93e3---75004214123.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/lacacd0fpsa7ck6fegnbg08psi/subalu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb98275e503---68129162290.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/16700568988.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/5068484115.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/xujabanasaworab.pdfIn PDF document text
    • http://regmac.net/userfiles/files/lerusonakimajebivunawepe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608816d8535fe---riwif.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nsgm8rmn7es4hji9tahf9r0hqa/zitekawuxut.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/95065528520.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16128c3bf569a6---ligimobuwatasofifel.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/zakofiwofije.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0159017052---10239475677.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2b31348f013f4f3e80c08dc3f62a5837/66749756236.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b556f158d---lolukaluniribarikitut.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/89003016747.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822deccdc97---43999933144.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7836f926121e412045a64a0c7a2b0e1b/tesuvovisi.pdfIn PDF document text
    • http://beta-rc.com/upload/files/21311238148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=counter+terrorism+tactics+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 10864 bytes
SHA-256: 740bf3d48bf65d3f839cae27bd093b78a2dfff08851bf9976ced43c3049a1981
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 19012 bytes
SHA-256: a130f892b0137b677eb069237516b03f238bbdc6c2788b2dcda243f32df6d11a
font_02_sfnt_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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