Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebb5229e5856b63…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 11:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a169939961bd67afca06aaac529ca80 SHA-1: 19f1bd72fe864d02909a56e8a0571c14b9d3b423 SHA-256: 7ebb5229e5856b63ef9072679e91dd73c2da86c4f8a4d3dbb2606fe90ad00831
156 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=illustrated+physiology+pdf+free+download PDF link annotation
    • http://letresorellebio.it/userfiles/files/95124450218.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/3820468749.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/kaluxilorukowivu.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tadijafetoletiwemulutidi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4f3dd204e103f74a195c7473c073f2b6/35535297752.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39a899b8d---6322100234.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7c1bdeca3775477ca5c75a4c9a63a167/lupuzowomurudo.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/4788bec524f78f453a011839d9e416be/xemabok.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea07ae38a---zuzazugufexebiziwere.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c82ceda0a1---35538733481.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/pipilemuxeje.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/11653527556.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/gupixi.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/bevixamikilulogoko.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/faa45fead3dab9c513180f61e5f38fb6/87942192437.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a4425da06cc98378cb5852c6ca4b186a/69725390397.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/74741707177.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/70529289061.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/savagepamiluvanuxiv.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/28270574121.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/79804913694.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/31989846824.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f184e3e6cf---24171716911.pdfIn PDF document text
    • http://hak-al.com/resimler/files/kigag.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_off0000c312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC312 11028 bytes
SHA-256: 44f9e94bb4dadbbc4f92c9f791093609570edfa14f03266977c0750d52e62b30
font_01_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 17736 bytes
SHA-256: b0da3aafaa95d64abe6d8dd4ac4363ea7e5730db81aa5c00a7270b29f833858f
font_02_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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