Malicious PDF — malware analysis report

Static analysis result for SHA-256 95113f735d0c8aba…

MALICIOUS

PDF

74.9 KB Created: 2021-10-10 09:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd46a096d61a61a1263c0da819cc8d06 SHA-1: c4d98fc77cd2ba6281fa4abf78c9d8a5fbe880ac SHA-256: 95113f735d0c8aba40bfce34f00acb506e16c3d2653fa372bdb6a1033bac9fdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'invoice' or 'payment' language further supports a phishing or scam lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crewmak.ru/uplcv?utm_term=30+day+notice+template+pdf PDF link annotation
    • https://www.hmgfinance.com/ckfinder/userfiles/files/woxurukivupolepi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/eqm7jdb8faa07gogd7voq93h55/45329355821.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/gagom.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b010a4e51da2148d0d61328396ca34d2/63986494584.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/tebukonalugixofatuba.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/46655048012.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/18950549587.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/20582272501.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/fovamesika.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/povakudepo.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/76618477221.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/nuxezofidoxapeziwopediko.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/fijalixisajokos.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/woxusidaxigufatuzululino.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e1a712e7acca6d9cc455677fe659351f/busunonufuwemigomukit.pdfIn PDF document text
    • http://koala-al.com/d/files/17452779132.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/59398950496.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/50670966213.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-10/file/19253022060.pdfIn PDF document text
    • http://palami.by/images/file/94386678959.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/72765219679.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/ximalabisinujupil.pdfIn PDF document text
    • http://xinnethk.com/userfiles/file/28721472022.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/ninanina.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-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_off0000c726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 10824 bytes
SHA-256: 6b46053b4d1c603626dd1e543d79513049473e5bb7d841fd6d5262a31f6824e4
font_02_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 17112 bytes
SHA-256: aedf2a001b1057276179091bbed858a6725b1c2f4d2220b7e2aba74f91ded3f5