Malicious PDF — malware analysis report

Static analysis result for SHA-256 7492cc93ed816a5e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 10:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0be24f73607b47c69abf041d3e623ec SHA-1: 3c315c8424c0da88acafac3b449012decb175d44 SHA-256: 7492cc93ed816a5e178197c6bbc5376d69f0525ff8e279125d3e5bd2c2e4c69b
196 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 are part of a link farm hosted on disposable or compromised domains. The presence of 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=samsung+a31+vs+iphone+11 PDF link annotation
    • https://ambulatorioveterinariosismondi.eu/file/50088866570.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/miwevatizitev.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/50222407538.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/91136785155.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bumujotibunoxavelub.pdfIn PDF document text
    • http://atrsara.ir/resource/files/37371203238.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/tiketaziguku.pdfIn PDF document text
    • http://domario.ru/userfiles/file/39331674894.pdfIn PDF document text
    • https://limsurdua.com/contents/files/vozinimekivadanul.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/bee20c32eb2f77c927eb30500b5a7ef0/29542001257.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/molojagubamob.pdfIn PDF document text
    • https://tch.lu/files/files/dufet.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/29166931757.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/64523204690.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6527afc4---42162197458.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/95804847909.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/fubogoluwejulotamazoxiz.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/vorugopupulurigujenixivi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9645c0cbd---24071491674.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/27601176799.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/fijuragupemilu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/03c4e31e702fe08e89ade85d44a6c2c2/mikidipusebudafelejad.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161306a1b91a2a---jitaguxowoza.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/kemimezebudipu.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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 18972 bytes
SHA-256: bb5e382475ef9b6877f43c17b10ea554c4a01c6dcd5c39ebecc2666e1f940ab3
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10920 bytes
SHA-256: 14fa4b834b57a6bbd2a17e2a0a3577295b3f350f4948713eebb187729956a9de
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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