Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e56315a7765f2e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 20:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88b4b21ee79b902aa55b1eb37a73c10f SHA-1: 307871a107c73dd2817d35f9682f756f12250324 SHA-256: 72e56315a7765f2e3ee5848d14cdb951a3ddca0d4f43df21735c657f76179f95
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites and other disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nedirajtebosnu.net/userfiles/file/fegevakuzel.pdf In PDF document text
    • https://vietrocknet.org/app/webroot/img/files/36976804509.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/fonabubamekinamutapopusi.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/35686418429.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2f1f41c4fe2c420cb9285895411d11d0/getisekifilitufekos.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/bevibaw.pdfIn PDF document text
    • http://newworldss.com/uploads/file/zutaguzagegatewowizabes.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210903_43B46BE89CB71549.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/4540303181.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/8t0cpchgu1ectft6p0stecg4f7/59706633258.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb717039d9---4363763829.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/vafuwisulo.pdfIn PDF document text
    • https://parc-hotel.info/file/99122981389.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/38595079754.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/bonigenetegutejof.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gce0h9q0cesihfoq7r5ievkrgs/zolig.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/vonevewu.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210916104956.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/35840731309.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/21837857230.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/27699188203.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/ditinajanupuxino.pdfIn PDF document text
    • http://strap.sk/uploads/file/leviwudopalufalag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=wide+angle+video+app+for+androidPDF 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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10464 bytes
SHA-256: 0012d1718ac6dc60d4a547e4a50c63a2a00d47766bbc7ce24f612f6beed12c20
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 16732 bytes
SHA-256: 93a8304cf06475de37b4dd22545ed9937a7dc4a20feb568f3db71aa653ac8df1

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