Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1643b2eb8636f4f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 20:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77b94b5ccd63f9c36dd783c914026f5b SHA-1: 7bc9eef67cf69efe4213e0d63c13b82df18cf833 SHA-256: d1643b2eb8636f4f61a511106596d97c4b5758c33b183a3d3041fa128ae578ab
216 Risk Score

Malware Insights

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

The PDF document exhibits multiple high-risk heuristics, including ML classification and ClamAV detection as a phishing trojan. It impersonates cloud document services and explicitly lures the user to install a browser extension or update. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lures suggest a phishing or malware delivery attempt, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://studiovalentini.eu/userfiles/files/78727790802.pdf In PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/bafefeded.pdfIn PDF document text
    • https://invest.pl/userfiles/file/56240954042.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/73224788009.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/2245696416145637e0c3bd.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161455b11a6ebe---gipuxo.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/vetukusixamogi.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/77209701921.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/76322656712.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/82810248894.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/85272224987.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/vuwutene.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/zipuxemuwe.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16138d813d210d---5747771699.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f291935be---55123638443.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/petifejidiri.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/larawitikelokoxi.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/28143269740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=full+version+of+excel+on+chromebookPDF 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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 17760 bytes
SHA-256: b6f73bff32ccc80f714a50241e4fbfc156de6927274eb85ef755de8c3281a79d
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 10816 bytes
SHA-256: bb5dca398b91eae7db57c11b81e247ba72af2bef13eae52e9e2a7eec38b6c4f1
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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