Malicious PDF — malware analysis report

Static analysis result for SHA-256 593d03488532c912…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 08:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01e2fe646cd59513d38194eb3a2a0b3c SHA-1: db66bff33e6ce3c84449cd2bd2c8d2ed72195ed1 SHA-256: 593d03488532c9128ff3632e3df0a9308268c1a4369a51c871c68dd9f789b8b3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=side+by+side+plus+book+1+pdf+download
    • http://bociany.sk/media/file/nabapirab.pdf
    • http://jubileejec.com/userfiles/files/kimusorezobose.pdf
    • http://vpsystem.com/files/fck/35931092325.pdf
    • http://engcaphone.com/_UploadFile/Images/file/pewimeduke.pdf
    • http://gtshotel.it/images/file/nawugas.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653a80f01a---fuwenuzesigoz.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/bewimusegipemak.pdf
    • http://4rrecycle.com/files/file/45808387322.pdf
    • http://snsi.jp/image/news_file/46124164908.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613810b55c2d2---poravokuge.pdf
    • https://textosolutionslinguistiques.com/upload/editor/file/xebegemetipomujemeravipe.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425d45e74ad---sivopokufonap.pdf
    • http://mijn-nederland.nl/userfiles/file/donitoniwapu.pdf
    • http://daoltrading.com/userData/board/file/nipowojida.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dcbf65014---41423143729.pdf
    • https://derfo.info/resimler/files/gonadexarededanesakuzo.pdf
    • https://ajur.rest/uploads/userfiles/file/fogibuwu.pdf
    • http://tarnava.eu/user_images/file/vamatesumikupurumenuku.pdf
    • http://nfraccon.org/userfiles/file/kenoguvinoxerudewudu.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/bilozejusazu.pdf
    • http://przedszkolenisko.pl/userfiles/file/fufodaxonek.pdf
    • http://speckrepej.com/upload/file/devipo.pdf
    • http://sicilalluminio.it/userfiles/files/88279650227.pdf
    • http://albertopizzetti.it/userfiles/files/zawosadotikenakolifafagi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 16792 bytes
font_01_sfnt_off0000edf5.bin
337b4526af3d105f108935021d279d23ee50e77914cc881de06838d45e2aae7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 16808 bytes
font_02_sfnt_off0001196d.bin
83f3a7836561ad389f6bf7c6e08ca660e23dc71b935cbf79aef68a0a00358045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 10952 bytes

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