Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c7c4ea1ff332d2…

MALICIOUS

PDF

88.6 KB Created: 2021-08-24 13:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd6e795b77b217229f9dba31fcf00842 SHA-1: 26cdaa24b546b90474bd98f22b52620676276764 SHA-256: 26c7c4ea1ff332d2352d8f666bc04fc6fd83166860495c0a9584c98cdf07ac3c
164 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress upload directories, indicating a malicious intent to host and distribute further malicious content. ClamAV detection and ML classification strongly support its malicious nature. The presence of multiple external URIs and a link farm on disposable hosting further reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988f7049be0---53572937515.pdf In PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b95b96124f01af93303a94a49bf72332/furimozuwukikajiduji.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vkc2l5djd9t5t2mpm0c10ruih1/vojadewetatebulebaxezeji.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/67b9d21a5c25ad9d3471bb9664dfbc2c/22947442021.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c3d5a64aa509b8cb4d5b40610098636e/pimezetixuzuwukagomadolo.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/99030612486.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de25613f5---85517267202.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d33681ab4---33553576939.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d58683934eb408683530c3075aade666/vewadunulatudunojad.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/85116022788.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/22038685853.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/najewivezaxaworu.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833db831761---suwaza.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jg5im6ivjuao2m2ua2mtpfmmpa/37489169641.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/73074833289.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161218c0c01015---87408084611.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/mogaxip.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/35716320291.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160edb7beacc8c---91376123663.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf68ca4c06---fojifuroraxojepebujinus.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/80911417268.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/bdn8nqquhr54ktlbk892707l1i/938105543.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/difuveseko.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/nutiwofuboriwo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/99742744732.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3e16698ef84153875dfbfa6b986cd836/63985477926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=plus+size+figure+drawingPDF 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_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 10560 bytes
SHA-256: c55c265b4dfc0d1320b58d24293857f27ee1790891b7138a0f6fc57702c92633
font_01_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 17600 bytes
SHA-256: fd979f72012ae05c2123052bfca87e4c0f44411f42f261b0f36d3b778409deb2

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