Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dae68eb19493267…

MALICIOUS

PDF

73.6 KB Created: 2021-09-22 13:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbbfb1e7796fb1ccd5de14f7840efee6 SHA-1: 1fb46b671f13fc2a0046d0d72d98f4ec3a555743 SHA-256: 8dae68eb1949326785e7188fce625ee3d6774aabb50c7c3d4b2c1b490712fe40
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=kirby+64+rom+usa PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613794cd4f10e---wugodifupelaveja.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/zezelomi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327da4e6043---tumisorizevimiravusim.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346abb13b7b---bakikizulelap.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/wisaxubi.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/99245172339.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/epbceb5nsd24dknq5mgul8i680/14068370458.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/91153111605.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/texedimudozizisadivo.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/330253709613ca897f0384.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/52551581837.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/88411392596.pdfIn PDF document text
    • https://alariel.be/userfiles/file/80298925536.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/21969088323.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210920_1EF94BF12DF55CB8.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/gafaposizimazavi.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/55208335075.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/gonawix.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/64684489368.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/ditebusawozawefivaka.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614591c8b1c23---92169316530.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/95875520678.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86854726d---11683858186.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614542cae2857---sirixaniv.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_off0000bde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 16540 bytes
SHA-256: e381818679c1ebc801b08f5e583c89c096d8447a9e63c256a19ac3fd0ff95bc9
font_02_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10480 bytes
SHA-256: 644683bd370dde4faa4af1eb313c9ad825bc0820aae9f3d2d085fc3f8cc7c779

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