Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ce5c70b400d225…

MALICIOUS

PDF

96.8 KB Created: 2021-06-30 11:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5d0bcd1f62827e87599f72373694d4f7 SHA-1: fdb0a24baa9903d1588cf73860cc0aaab6a2895b SHA-256: 26ce5c70b400d225c4679a432357405d1958d04a43aff286ea4778f7108fbdde
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to trick users into downloading further malicious content. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 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 http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39b810603---begujalumele.pdf In PDF document text
    • https://aaaxxion.info/images/file/57860131486.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ilbipdir5foh1e05amka14d0d8/25305063594.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63e60ac89---57544473401.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/xasowuk.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/4075001312.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/db8d8bcfadf9e101d8be44941c682d6e/5250623616.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56bae1e99---tukepisenow.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/naxafikekakilixox.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a335fb6f680---25879276631.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/90643331926.pdfIn PDF document text
    • https://whitesal.com/data/images/file/9019_20210521212618.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/sogopidun.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r7rgb89alu3s2rvb0932k7oq01/67335105199.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/7op2e3tcb6u3okp8ll9rkd7psr/dumisemumesimotejigixu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c91ffb6a65a---76154343451.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f821888d61---nunizam.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/u1ikqhab9a9tbb7f1e4cvlnmre/77868568881.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/8ebdcfa3fd59ab4bd9a92615868193fd/vejufilexewobolof.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/17832512135.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/92074941910.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8k92sg3c6u72ma9jein16p674u/30955358526.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58f5a648d2---62064882366.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/repudagofewez.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1d9af9b8---pinuped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=after+effect+promo+template+freePDF 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_off0001196b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001317d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317D 17240 bytes
SHA-256: 7f468aa696629449a038bfcd3a2dc7388e712716d9486ba97e04506349dea740
font_02_sfnt_off00015ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC3 10256 bytes
SHA-256: f55a07d9a05b11158d2aa93342c14f4cef646e5540f0552fadc78e03e6423ae2