Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb458e0bb6e767b4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 07:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f485646aa8bebb46c4448974510f9db SHA-1: cfcbd29a50e5ff8847c60f67ffc48d125c4b7421 SHA-256: eb458e0bb6e767b4d5f7fec7bfde6c68916544fe2677ae47e8776d659c099761
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host and redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baxsporthorses.com/userfiles/file/turoxanujolarirekawuke.pdf In PDF document text
    • http://b40555.handyfriendship.com/upload/files/49101878139.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/sekafovusoxozilelewur.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/94402584902.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/sirisuvonedafuw.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4b704989e5f1717cf08b7b8c7f1e05e3/51567464056.pdfIn PDF document text
    • https://dacola.com/upload/files/81475983722.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/45386914573.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304dff8f79e---webajikexubob.pdfIn PDF document text
    • https://temahr.hr/files/73102992434.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/31071427620.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c19f68c8f757bc2db5afc27db17baf88/gojubedezokibato.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/befulabolevewopomesume.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/muwalumakinulawiz.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/39428399151.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ee92aa902f52ac8b695d441227ab32bf/lufud.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/1944281475.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/49178275656.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/rusasagijobezurifaguroma.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/69066795178.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/lezafutisus.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/99732202406.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/85430972624.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/sumileromiwi.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/82908457450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mcv4u+nelson+textbookPDF 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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 10440 bytes
SHA-256: bdbc4ace6811f457534a0e5d13bb835ea29ac3b9abbb54b8d70a2e107425fc95
font_01_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 18316 bytes
SHA-256: e36f004ee4e0d4cf2e5e4a6ab908d034d94fe02578c038977f817ea3c7de3e73
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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