Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f6cd8565b6759e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 05:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 019db61cb4fe659538e0b306c87f038d SHA-1: 4b81fc2beb351166c901f0fb844e13bf28c02876 SHA-256: 87f6cd8565b6759e84d90391bcb78e35f73f0cfdb30a6eef9e9eb58edc0afda5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification further supports its malicious nature, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://huntic.ru/uplcv?utm_term=call+blocker+android PDF link annotation
    • http://oticonshop.net/ckfinder/userfiles/files/65858446290.pdfIn PDF document text
    • https://aaaxxion.info/images/file/lirufitu.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/29155624157.pdfIn PDF document text
    • https://harom.ro/files/file/24067128822.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/95796081648.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/66292297655.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/76043125569.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/898c9662cb01164da48002f80e644013/93461050187.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/wewakokuxuxe.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/dedodetokekajezupa.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/denebizexakizigusovotiki.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/73668462277.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/labumogijebizafen.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/46136040995.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a27c8239b---gujadoj.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/53924379977.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/mikazewavevaret.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/90148827305.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/81099662215.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133c44a147fa---pujamakemew.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/39594174798.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/lagepobinofuf.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/85367022808.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/29489906555.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/nebazevukoguvi.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/8133663949.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_off0000c099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC099 10360 bytes
SHA-256: 26d3c44b04dd27fdf58cd026068851cf1ff617719f326e6b9480d97b507e32dd
font_01_sfnt_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 18008 bytes
SHA-256: 926ef4fe1353af0f69807b249f86413414a88b24a29427425c7981dd68137ac1