Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d2f6bf571c42ca…

MALICIOUS

PDF

111.1 KB Created: 2021-07-21 15:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 833a48ba20e6c638d2a90c577649b42e SHA-1: 210cdf8f00b84b44da0c37954124f7993dc80f12 SHA-256: b3d2f6bf571c42ca10deeacf5fa68054c5af6cf95f14c7362d2c1b82da4ddff4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://hesexpo.com/img/editor/image/file/97122011478.pdf In PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/6eaac771d37f248556620ed28f4f34ec/64232683367.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea43e02eb---90483434746.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/dagawir.pdfIn PDF document text
    • https://belloverde.net/emailer/file/nezexenapobuno.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/lupuzakemijiko.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/tufeletarep.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ef779f49b1bd1663fd176074bcf199fb/gusonegobijidapeta.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/85771695615.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vi9ghn51s4sjdaq96vrni27g40/midomijijojiruvapofu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/4u9nt6sbsds04h5d4odgtgusir0duuef/wodosoxutelesagi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d2a1b0ed---18810354334.pdfIn PDF document text
    • http://www.bandungmesin.com/file/saxalafabojuloxemelowo.pdfIn PDF document text
    • https://negaratoto.com/contents//files/lexeverokigudugopigepewim.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/bazobesijevejozegubalel.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0fa7ba60478148f79b3140457e889f35/87459710373.pdfIn PDF document text
    • https://lasanisports.com/files/wunizumeluwazovidatebuj.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d87bf5ae4529f22a769ad961bbb66145/80997059700.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5e9bbc4c382b3c2fb96b638944d63f2f/74823465071.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/51064308800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=peng+block+for+hip+fracturePDF 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_off00014dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000165cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165CC 17780 bytes
SHA-256: 2f02168c15a16eda53e6db419b2096863c1ae12ddc62f45d12ed24a722d3f9f0
font_02_sfnt_off00019494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19494 10924 bytes
SHA-256: bb1be44c998f4dea63464708a790ae7f4c7919a1d59f63b8d124978062f9a288

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