Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec48d409540e405e…

MALICIOUS

PDF

74.5 KB Created: 2021-08-17 09:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7ec8e656836eb7e569e9b647f3af6f68 SHA-1: fc2734036a01f896957798a1c30ac228304a1f57 SHA-256: ec48d409540e405ea7f442dd1d004f171b5f0e1c3739ec773e8320a91ddb8352
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution vehicle. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files, likely intended to lure users into downloading further malware or divulging sensitive information. The presence of multiple external URIs and compromised CMS upload links strongly suggests a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=skyrim+why+am+i+suddenly+a+vampire PDF link annotation
    • https://apizf.org/public/file/88319312327.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/97p9l9ftqsah6k6rj3i1u0h3el/zivelanob.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gividom.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/73840962542.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r0su5ncmujovjhldofpcjk1u6t/96745041356.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf91c5cb0d---90713206839.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/83629016835.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f899ebd27---refiz.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210624_9258343DE34459EA.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/vodajojarekosogagobel.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/vcji1t74mn4m7emh995b784snt/41349310192.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bda6e64f6---66061096716.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd5597c847---93604110215.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/25515651776.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a656b43086---vujidilexadajitoserul.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0500d8df26---zunolovaxorezejime.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/fetujadiwugire.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/kizisuwisawoverobo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/eat8l44tfcc5ljjchbh215tuc1/45924034564.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b27f7fdaa29---puximadofitinufanajaxag.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/33365507285.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/57791825420.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_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 10972 bytes
SHA-256: af6b272c4e92693f5e91f12c4f599917bb3b965b53dd2d0924c2c6b9db11abe8
font_01_sfnt_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 16188 bytes
SHA-256: 68f2d47e1fa205e46e03708b037cb11e8723a05e3c3e70cffd82cb1a1637d072
font_02_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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