Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d31eb5e53f32393…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 06:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 57a3307d6fbb9d4bab35174b1ab258bc SHA-1: 91ce7145b3a51d6d9e7f4c0639561d3f718072ae SHA-256: 5d31eb5e53f323930cdf6a3598ddf3033aa5bfe0a6adae8f080f428d48543756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=mattel+junior+scrabble+instructions+pdf PDF link annotation
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/45360740749.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4e2604512aa06416eae88beb9f6a9e07/20031054119.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc950064a---6189331415.pdfIn PDF document text
    • http://hydrem.ru/images/file/giwojesumu.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/natinikimokadunamulupiteg.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/sexafufazapu.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/wilulimorak.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160f428ad9d3e8---fikimurobo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c436a5a881---fejifukidivam.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/80659552732.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/88019778923.pdfIn PDF document text
    • https://btegypt.comfile/48170391629.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/63080b9e73212298f49616f977bc2ad8/pizazeguvi.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/35852165268.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab3746b2ff---lololurodowezokazuzokas.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082465d3a504---wuzadulelizi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deae17c22a7---vujijepafologix.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a82fa1ad678---guzuxujiva.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/83196454654.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/43093720486.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/bidunemasobojupomalubewu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da60fd85b6---85550265097.pdfIn PDF document text
    • http://allycatering.com/userfiles/37323507670.pdfIn PDF document text
    • http://gdgom.com/upload/file/210701034728271342fgak9jbvwrmz.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/vizowesidafaxaja.pdfIn PDF document text
    • 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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 20480 bytes
SHA-256: 88670784dc704eefcaa9a74ea8a50bf773fd6743965aad53aabb1772cb48a445
font_01_sfnt_off0001060a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 10976 bytes
SHA-256: e42d6c9dd4e69f2f1fd2c2963c7402fbfd101d96991b2886c4b203f7245ce9c4
font_02_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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