Malicious PDF — malware analysis report

Static analysis result for SHA-256 25aa97c10fa2fafb…

MALICIOUS

PDF

66.4 KB Created: 2021-09-18 08:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d1be86c3f590edcd44bf46b4dad3755 SHA-1: b5adf85ee50f5e6ba9334b05dc7a28056a88a5ba SHA-256: 25aa97c10fa2fafb9e17a289d26b679f4c2b43e13f17a4ce983acabf67ced689
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and embedded links to potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/daa01ec84fbf1c1311d575f32018846b/wejovulitiliw.pdf In PDF document text
    • http://zhongyuemedia.com/filespath/files/20210918100842.pdfIn PDF document text
    • http://pvvc.cz/files/13606548145.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/62402236667.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614549f17982a---gatobisubobedipoxafovan.pdfIn PDF document text
    • http://rld-carbon.ru/file/nifitudalinevibowafidaz.pdfIn PDF document text
    • https://turbooto.vn/upload/files/sowuliva.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/37880107067.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613526ebdd7d2---14849642640.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161454fccd4a8e---20054653396.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/debufadapu.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/69294614825.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/56696826221.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d94af93a5c---vifilolokikud.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210907093143.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/bosesupekidetenopub.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161428a6ae62b0---2741210057.pdfIn PDF document text
    • https://interconformity.ro/images/file/belodo.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/80081307547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=snake+io+play+for+freePDF 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_off0000a98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA98D 13744 bytes
SHA-256: 3d965c53fbd2fbdb7f79d28e6dde9ad8d51aff814f0af146f7a115d16f2c9ebe
font_01_sfnt_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 10368 bytes
SHA-256: 698141c35d6d82b16a4dcd7db547abe1e995d1c4dca252a44db1cc61890077d5

Open this report in the interactive analyzer, or submit your own file for analysis.