Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bd4ca786fb45b2…

MALICIOUS

PDF

87.9 KB Created: 2021-09-20 22:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3ffdd89c532cc0438ff4685c422bde70 SHA-1: 8a6e8523739e1bc667f1b1b2c316eb476ff0bf69 SHA-256: 12bd4ca786fb45b281d1e968d11063b4de8612ed1942719d73943feb3d111a50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=list+of+philippine+mythology+gods+and+goddesses PDF link annotation
    • https://lexconsulting.ro/webroot/files/media/1935148078.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/fokawigufuwoligipozunokaz.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/26308306293.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/bimowikivitujad.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/makan.pdfIn PDF document text
    • https://proia.bg/userfiles/file/lukebukilebanumuzutanoko.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143aee70e319---zoximebedulisofatubo.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210913164558_si01ji.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/banebutexageme.pdfIn PDF document text
    • http://czyxchem.com/upload/files/joxisewoxukivuxamali.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210914101521.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/dajojolewaninuzele.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/botafalanowibudivulo.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/budumokik.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/eb78768bc6019ed106a078004e080c36/revexiwotu.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/30799755157.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff90f866a4---webixiberepopotagolus.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/dixikubanurokasozarovo.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/benavasimuva.pdfIn PDF document text
    • http://atya.eu/files/file/fitisinajugotopezusiru.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/61568646279.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b5a3f3949---71330223693.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f803bd00---vusesosimitexelupunowokub.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_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10916 bytes
SHA-256: e7b4aa6bd5360df3ac2c3de72b796a1dc7abe0a2b6b3788270826b6f72a7a508
font_01_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 18796 bytes
SHA-256: 414dd0572c6bc35d9431fcc869e451d3455007cb42a38336c1f2ccf5d3a714c7
font_02_sfnt_off0001393e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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