Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff4b17ecfd7b21c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 10:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 262daaa9ad62865b8167d2eda8bd4951 SHA-1: e34ee3a90b9f4c4176e2105e0b1c41cfb602ea40 SHA-256: 3ff4b17ecfd7b21cb98d9a05d95ac7c966b2d66dae58bf3d0d20dccfe2d854c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jetaneujavk8dblvck62umrtp1/95289335958.pdf In PDF document text
    • http://gianniarnaudo.com/userfiles/files/38364093346.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/povutujanujukitugesawi.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/86710140185.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/95783966565.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/75307786468.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/sajew.pdfIn PDF document text
    • http://mp-journal.com/media/file/kukonupidazepuj.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/fanutudel.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161399bd5944a2---69144940192.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e5n8575m59hqvuf93duj0cbk3/dibelezimapolesusowudugu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/vokekorototiwuf.pdfIn PDF document text
    • http://christopherdallo.com/file/subopepixu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c99769721---rujavijunizudafapana.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/89035612762.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/72783904730.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/2072116589.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/masupi.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109041825109444.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/30227116408.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca1a20d37---pesex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+fix+pop+up+ads+on+androidPDF 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_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 10592 bytes
SHA-256: 6c9d1f3a073324635099be005075ceaca99b93cf8d48e8b64958094dd8430aab
font_01_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 18648 bytes
SHA-256: ec59e6ea3bde05b99cc107fc72c3ed2248a3a89cd4d0af63d25ec76fc3e4105b
font_02_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1