Malicious PDF — malware analysis report

Static analysis result for SHA-256 95aaa16678bdd18a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 18:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 536ebdc3f14a0197a2993f8291dab5f2 SHA-1: e77856aa05fbc0a745c1e5a88920f7923ba3206a SHA-256: 95aaa16678bdd18a037b51a95e7d86ce0c5a03bfd6e9fb33834e9f422b6e2dfd
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised or disposable domains, indicating a likely attempt to deliver a second-stage payload. The presence of a visual download button further supports a social engineering lure. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://k-ookuma.com/js/upload/files/23006541394.pdf In PDF document text
    • https://locktactyuma.com/userfiles/file/lalexudadizipali.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/vatakigud.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lujlnghoe4udh8db8tq9qa6979/mojawosiluxaruvoj.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/u658fk70vhkt7cds0sak41s504/90766214847.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/79821695331.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/kajilosidefeto.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/88278556460.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/vujuluxusajo.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/vejibopuxopofutibu.pdfIn PDF document text
    • http://vucert.vn/uploads/files/zafoginuwi.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/88083423056.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/60013286897.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/13260756653.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/kokepemeta.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707ece77684---ladiwif.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ee164e8a3aa5f5e64f9e4bb89c720ddc/88386856115.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/da283b19b7b33e1edcdfa0b60f546173/63093430784.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/wazubebonob.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/watijulewu.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210602_0FE75D7EB1A051CF.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/9205483958.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/96648063215.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/24159664190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tutorial+joomla+bahasa+indonesia+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 17880 bytes
SHA-256: a46692de086cbf1ffb933d7b6337ff95133c9cc31927e49cf89f62c5ea0d387f
font_01_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 11096 bytes
SHA-256: 5b1cebd0c289f2eaacbc7de6191eb4c9aec052d1d66e3fb208dbf9e7a3e9822b
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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