Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b9b846f0fb84c4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 12:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4afc95a09f7172350048484b11ba228 SHA-1: 7c8dc2eda85a94e0ccd3db6273a7cdf83bdb2063 SHA-256: d8b9b846f0fb84c4d428d0906cb6180a53396b772af90d8b2b769bc2473804c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to websites that appear to be part of a link farm. Several of these URLs are hosted on compromised CMS platforms, indicating a potential for malicious redirection or hosting of further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://naphotelbangkok.com/userfiles/files/puwewubadu.pdf In PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/51359042546.pdfIn PDF document text
    • http://mextro.de/upload/files/leliro.pdfIn PDF document text
    • http://rayer.cn/d/files/91622761922.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/33979129827.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/makutibo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab350bb69---54524386152.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/27175209973.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916042013.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/51148980664.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161328c531df89---xuzavexitakulokojotekurez.pdfIn PDF document text
    • https://italvaping.com/file/janagudukejatekomalofudez.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/28679890244.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/neduxafosugodimobero.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/soxoruxujanupo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f776313662---desowupuvo.pdfIn PDF document text
    • http://kisito.com/userfiles/file/87462634867.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/tumafapuxufon.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/e71kiieppifn0lhi2c4ss209r2/87564817335.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/voxununelenil.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/70355744254.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/gubunixifiwujifewipapalis.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/tuzapukexivozirovidowajet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=s9+custom+romPDF 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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 18040 bytes
SHA-256: f91b04a020d47adcd9eb6e819bdfa1472460705ddd6a4e51351eff9229828e53
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 10196 bytes
SHA-256: 51d6b45af0c81b3f78f0dfcd5d1f6befd9f56fcd1ccb93b3a24c0281f7dd7867