Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02923a3349017e0…

MALICIOUS

PDF

90.3 KB Created: 2021-08-05 07:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49535e84c20b48d557ba20d4d34552c3 SHA-1: a1e0044985d32a74afabdec6dd8c948539d2bcfb SHA-256: b02923a3349017e09cc76458ed35eb37dd2c58d87805eae5907c816ff2743752
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a malicious lure, employing numerous links to compromised CMS uploads and link farms, suggesting an attempt to distribute further malware. The presence of a visual download button reinforces the deceptive nature of the document. While no scripts were directly extracted, the PDF structure and URL patterns strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=cambridge+igcse+business+studies+coursebook+answers PDF link annotation
    • http://aiswaryamatrimonials.com/fck_uploads/file/napixewumene.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb069e477d6---40432170330.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160da411725454---12628592597.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/dd4f4d14d2bb2be6b79b14a96e9501f1/netenotimumosozex.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8c411d95---tenibe.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/1010353454.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/vikewasugilalixogemo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/61e668febda18003bf4d28892fa65154/fumid.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4efd1de48c---dijidovixiz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24a6ead90---lowibozoro.pdfIn PDF document text
    • http://zae.me/datafiles/file/zeguniwer.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbc6ba77d---zapebomijugivuzikomaku.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6f251229ba393eaa70f0b28b8aba8ef9/pevuvosebot.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlqkvv9rldsjt8tqkq4l9cpt13/16611110071.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/fifitulozakefo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/msfnq1bnluedsqpk0erjq3mo03/76982500902.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/vodozewobititatolekewep.pdfIn PDF document text
    • http://c-amc.com/upload/files/dovinenonevor.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0622dd06a8ecdc650469f1c1ec5f384f/17073882216.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3714126fb---ketajetekapimavinoluvetot.pdfIn PDF document text
    • https://arerp.kr/data/file///8218498368.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/mazujigolatawodejobosu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/stvvcjfch2ndj48g4an7aqqad3/zeriwokegalujo.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_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 20332 bytes
SHA-256: 1599d075fef62a38abcc78359a5813f113550771b29b58ec4abf052e93b48c31
font_01_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A9 11116 bytes
SHA-256: be5da448afc8ba66fce1a2902d0212669eb400412305813e0af82ce73c81c534

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