Malicious PDF — malware analysis report

Static analysis result for SHA-256 99afb5895046111e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 22:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 35535ecc67bb39a8fb3e8a31f69da501 SHA-1: 2fff958b038b39dc3cdae257903acb4f8491fbef SHA-256: 99afb5895046111e0b42f6df661aed6cd3325eb05c3d249a1c52869a20e1f7b0
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dc2a690d---42669121065.pdf In PDF document text
    • http://jucal.es/images/file/rofekidirigijovobo.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/62390987969.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/rotilatigatuzutomaxeko.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/sewuvatiforikitofi.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/guzidinut.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/77042787587.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/10431070449.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ccbf45fba3---73954080376.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f7ae3f731---sotesavozunadekefawego.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/kurabirobebemof.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/39503810539.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/salesatos.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/2024143477.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/kafiwadu.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090318042973499.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161054cc5c91b8---modixivi.pdfIn PDF document text
    • http://msiutilities.biz/documents/jexepigi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7b27a7ef---18688591067.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc39b4e015---kofetevezoj.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/55014653911.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/felomexagusidepuluwazor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ibps+clerk+previous+year+question+paper+book+pdf+free+downloadPDF 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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 11308 bytes
SHA-256: 3f2a00da8ffcb38f8645213a8d32faebc9cea2324b7a7efbf02989beba5074ec
font_02_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 17964 bytes
SHA-256: 5a7ceaa67ef61fbfdf286ac889b5b811f9ab2b7d849e6292569627a4ba1d84c0