Malicious PDF — malware analysis report

Static analysis result for SHA-256 661e553d5f39dbb3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 20:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 813f44d4e4b719c5278c4e04cba07a99 SHA-1: 706eeb868e0096051a6ee9938f743457668a02a0 SHA-256: 661e553d5f39dbb3d70b1c2e7b726b4fd528d88b534933957e270d6a5d13f01a
196 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a second-stage payload. No scripts were extracted, but the presence of numerous suspicious URLs points to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 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://drafthe.ru/uplcv?utm_term=cube+call+recorder+app+download PDF link annotation
    • http://gayaarchi.com/userfiles/file/20210912030038.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/75235950600.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/tojawifezuxikulogaboduxe.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/kobumusaki.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/pitagavuzil.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/nanixabilewuluvotog.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/86734276495.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/96371259153.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/xagebikironuxafuw.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/82569743769.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/62624513667.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/posovugutuvib.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/fexaba.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/rurijifuwumafesabav.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c285502802---77701740541.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141839f520b3---risukobusezadav.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/tidupunikenu.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/lowakedavijeva.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/49692229749.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161456f7dee303---5747490256.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/63689396029.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091a741c8c---13170574129.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_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 17012 bytes
SHA-256: cde0b4c13e41cd05bb71a0f1acff05ec8cfabac96c718081390bd74051fb1554
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 10504 bytes
SHA-256: c2f06339e8a2d7b7e5acc73d6665cdee3c99fe59b41952dfe941aba17626474d
font_02_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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