Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6050853477ad071…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 17:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d340ab31fbf0d1fc2bc6bcfee12017a SHA-1: dc6ddf45b8fe002a43f630df13fea76b774b8c09 SHA-256: a6050853477ad0719edb6f95d87112531525c5d22020cd12b91a2ed4de289cfe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aklond.com/UploadFilesfile///2021050506112831.pdf In PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/71706480730.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75eeb03005---7406738010.pdfIn PDF document text
    • http://yaheardfamilyreunion.com/clients/6/6b/6bcd2b4031d0b832efcfffe4b90de728/File/39956510165.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/27626788473.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/i957h4c326mkm4fdh241h4o8f3/luzimopavebi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6da634b3---43823664690.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/24980703644.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/75653684082.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/difunesixusifax.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f9bfc757816f62b7132622c4d29d9e4d/mufinuzozupuwivaw.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/53569270182.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/29527897196.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f7b1e6a27---7743579364.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160834ee687a22---ruwiteriloxiv.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210826075818_bmV2YWxlc2ludXN1cg==.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/87205747675.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/nepamidi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21d8d368b---tixupagulisuromup.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/38871511474.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7v28rhmesaf67n5sfdmjen1r1b/fasewemenuseduturuka.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/redekufivedatabuzesetopet.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078996037729---xivezuwidadazuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=spring+into+technical+writing+for+engineers+and+scientists+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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 18464 bytes
SHA-256: 93a6c126110800b491f9889906774d9cc57e127a070840a39a4848a13756264d
font_01_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 11060 bytes
SHA-256: 7ae29f6ec562a2826a1557d1700aa2038d0a33039ae84ebccbf4cad97011e0c7

Open this report in the interactive analyzer, or submit your own file for analysis.