Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfae8e2c87872e45…

MALICIOUS

PDF

92.3 KB Created: 2021-09-07 04:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55b2789081e5824d73557d96d379d577 SHA-1: 0df839cb62d66120532e04f03925d8533160e65d SHA-256: cfae8e2c87872e454eadd68a2ed21b4af3961d73e42627f204a40e8e31ba3809
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://nbnjl.com/userfiles/files/garenelemagifoderulag.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/xorusizuzabal.pdfIn PDF document text
    • http://chinahongji.com/d/files/59211070188.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/pojexekijarapubivowewunol.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b431e5cccc---21722766518.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084928c92175---zabogififajiwasafapabal.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/dimetoruvak.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/velexebamazinizixajunu.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/mukisonoxibidebedawux.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/49013888895.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jp7ikt7hvmp74hg7q6gq0oug2d/wiginabopexerazof.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210629035256.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/87511406109.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/25606515171.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/zagogigezexurutivo.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/10458125650.pdfIn PDF document text
    • http://ruihuitax.com/files/file/47423555670.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608447acad286---84025923954.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8e7c2i5r26qor5f9q3r58dmoo5/zewigelulebofusuj.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/femibudu.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e936a601a23e4d27b1125ff831cf7ff7/2968623573.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/nenezikawewi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b100c7490---zakarasudixixetalazevud.pdfIn PDF document text
    • http://llux.vn/uploads/files/39813052397.pdfIn PDF document text
    • http://erimti.com/userfiles/file/82569079799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=practical+algorithms+pediatric+hematology+oncology+pdfPDF 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_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 11184 bytes
SHA-256: 561a3896c0c7c8ed897eda2b2f7124eef72f68e41000307e582807ead89a35d6
font_01_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 17820 bytes
SHA-256: 65ad3b60961c45cdf6431611f778afffb3e9d82ade11a0c3c942dbeed0d5ae4a

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