Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf31a00a6a25157…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 15:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8578dc38b9b661d048ed9e2a7a414a1b SHA-1: e768fc17789ed49850fb08dc9cb958b498bdd26e SHA-256: dcf31a00a6a251575b83e9c6448cd54ae73de35e7b9fce2770fdd78f840d9f4e
196 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://luxcottage.ru/stroykamen/userfiles/file/33834827970.pdf In PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/46979540369.pdfIn PDF document text
    • https://comfort8889.com/upload/files/maxixizimitopawibejoza.pdfIn PDF document text
    • https://pr-dienst.ch/file/fejira.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134a88ba7c35---tizibam.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/taxumotudalos.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/8663155994.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/dafavapa.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/51078865132.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/nuwarugalolazuvekuwudeki.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/tenikug.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/wisabijidova.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/xaxasokojif.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2f04a897d---modavixa.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cd9e428269954bba6ba6332959b3f001/68194564754.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/pulopokiserisuwinikelenez.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131155146e08---gaminexudu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/38f49f40375d89c3a17dbe32510a2b1c/92643976275.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/41718132662.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc37abfb1---78259724593.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/sifunugojegeve.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210906131727.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134386349c16---dofixutoluzumuduzosena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+clear+cache+on+android+smartphonePDF 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_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 17540 bytes
SHA-256: 4297cd6d3e82b6955f48115c2b7e04619b7527992207b2fbda2ee249bf1987ff
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10856 bytes
SHA-256: 85ea26cf9ec161d52ef72b8fb8d6ccd747b5a770b6ea2ecdf965a8f88296fb6f
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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