Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8f4d2094cef919…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 07:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b955132476e9a58197d11ce019d3f0c2 SHA-1: 45ad5626dacae23ab5003744ec0c6eaec95a4c30 SHA-256: da8f4d2094cef9191c269e68497ba1d2947308fbb23f6fa1c12b6145b0931cbf
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or phish for information. The presence of external URIs and a high ML score indicate a strong likelihood of 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 https://b2bircruise.travflex.com/bot/ckfinder/uf/files/5534616810.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161481e21ae8c9---xonulafinemorofe.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/tukadapuwo.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/zuvosexajupidujizam.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/24653776981.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/webafiwofana.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/44883141633.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/sawujojesopozafexor.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kufefuvif.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/50940633329.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/mupufit.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/zaroruwudoxof.pdfIn PDF document text
    • http://polletnv.be/uploads/files/83911615450.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/penasomumasis.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/visutajuruxabominiramejo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef14c73e49---57153039544.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/dumogazimejaduxijosepaj.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/35983340205.pdfIn PDF document text
    • http://schokofontaene.de/idata/63041551405.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/90541630207.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/temabaler.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161371c9bb312e---43581237301.pdfIn PDF document text
    • http://caythuocnam.org/images/files/muvuvojitosudibitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+oddworld+new+n+tasty+apkPDF 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_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 17676 bytes
SHA-256: 288791c814e0f95960526667c0c11b9a895faa043a53c5668ae01c31b8bb0dc3
font_01_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 10588 bytes
SHA-256: e0121380da6078eb07096db88e4d4bd790efe456cc9bd100a03367a03341fb55