Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6ae69b85c99901…

MALICIOUS

PDF

74.1 KB Created: 2021-09-21 02:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 046bb03fe94428ef416ee3bd0f7949ca SHA-1: 33c0a6b3b976cda139434519aa2526ae5ea6b69b SHA-256: 8c6ae69b85c99901c2523bd2edabc782328991aad8a4b9d03e28a2f319c8440f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier further support its malicious nature. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://jmk.kr/ckfinder/userfiles/files/vomalapadipilur.pdf In PDF document text
    • http://3e3i.com/UserFiles/file///dulamusadalifafevudat.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/88320679135.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/9304678166.pdfIn PDF document text
    • http://inica.org/files/file///vifitavudovusu.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sopunej.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/jodajiwemolefapo.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/377292578.pdfIn PDF document text
    • http://bibikid.ru/upload/68663155520.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/89506987325.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/nilurowixarufuviresose.pdfIn PDF document text
    • https://membermimpi.com/contents/files/52433491003.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210920215438.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7e0aeb0f7---98268165538.pdfIn PDF document text
    • http://clingac.com/d/files/7519448433.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4a3deae8---fopodupuxoxejadonezoru.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/32742545157.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613197697a61a---purugumuk.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/dimij.pdfIn PDF document text
    • http://sdds.be/userfiles/file/rokokekamavojixavaso.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210917190102.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/tikezigof.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/letejisejigapubejibajomip.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147872c7b81b---88210981682.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/wolida.pdfIn PDF document text
    • https://tch.lu/files/files/68386674182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=langa+photo+editorPDF 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_off0000be47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE47 17432 bytes
SHA-256: cacbff9f797f47fd3d83454b236aaf6442d764e484d07f3f3daa6c0a0c5603fb
font_01_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10416 bytes
SHA-256: 17bb775287c8ec5b840e5b68d8be1a14c68242563f4148504eabe6b8d3351955
font_02_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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