Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b4c6a25c7f3044…

MALICIOUS

PDF

78.9 KB Created: 2021-08-27 09:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5e8b35b6264fa485b4a75293c4fbf99 SHA-1: eb556751a52e3e4c8b7cbbc85b06ff3caa3571e4 SHA-256: 26b4c6a25c7f304489e2ecd05de1c824aa3d6c50ead9fe8bd505fc2c8da6d415
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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.
  • 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://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3ddf0b6b8f3a71f63c0a635e1af2b939/52468417019.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2605eba0a6604339c7b634d153169d55/jupusilujotupadi.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/40c0c88ab1a8ff1cc528bdfa0297e698/29914171320.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16117e85da551d---regelameb.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab9331b07---sobavesaliwam.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c62ca59057fde165c876268115bb343b/jofaxunijubajarukur.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ba63413907a58b09c925f81e26438fe9/36277627876.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/98477461292.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/32f784919c4a5479a8bdebc6d4b323fc/38778102075.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/25895274860.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/kujososedabifofefaveme.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087367b38037---91052664478.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/77214887882.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021082115552957.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6415851a8---12559072394.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/54236378168.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6642d6b71---wunupiwiwumeseb.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/bakipafuwixug.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160819ef2d75ef---39049485072.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cdf29bf4---nadativodumimipumijedog.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/67668382648.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/tapazemafebotabeva.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad703553ffb---1346498565.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/turijozikiliwig.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4f15c938---ruwazalikujux.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/59087987690.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/db0ecebea24040354741b52179bb471b/roxiwefekijomunaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=straight+hair+to+perm+guysPDF 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_off0000d2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 16468 bytes
SHA-256: f0aa04139d2ed32ab24fd1826ba17cea706e7d3148d363fe84aff55cb47e30ea
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 10840 bytes
SHA-256: 6b7bc8e70e3c7f2e6c8c7477161775f094d17d1cc4b220d937ae2c03cfb452c4

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