Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ac35221cac7ecb…

MALICIOUS

PDF

81.3 KB Created: 2021-08-19 08:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9a60249a0075a70773b5abc5fe6325c7 SHA-1: 826d0b35617e201c05eae2b843696b325d9f9952 SHA-256: 12ac35221cac7ecbf3fbe049e85f091443234a7e35ca8c5af34bf00a424ec094
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

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://synerhu.ru/uplcv?utm_term=exercicis+pronoms+febles+amb+solucions+pdf PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qh838enfc7efcplldqnddr6j53/dasusemu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/xitibawutilodasak.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/rubaxopoxorarosopusozise.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba014f27e6e---xubixer.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/fa62fbc82dd35af8ef0229a2149cf6f7/73839451487.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb2d992626---buluxiravoxibimojumu.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/46333850531.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae85f9f2d8---50391814557.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/21690905735.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021072304460273499.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118b18d794c4---97427433712.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qpi9mfsi3j74ei94q4si5bfq80/20182543171.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/62c3965aca38f6da901bacae9f73ac85/67895304774.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/nijemevodugavuzojazop.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vugefe.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rjfuj1jt0f9m78vhrqqf9ie954/dajazelupomofogodasazuf.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/98846606242.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160732ebd0b5eb---biniwivedur.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25cc39516---gobepajununamozuromo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bc089c554219a14b6ab7735452b785b9/4749458883.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nufikufogowukiji.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/60585564299.pdfIn PDF document text
    • http://industrialdevices.in/uploads/dikex.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/dojalumopipedawa.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/86744938741.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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 11008 bytes
SHA-256: 01cd1fec52a5a81f455ff4fea7106eea3dfb7b367161d4a57b2fc160104d44d5
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 18016 bytes
SHA-256: fd947bbe05c04b8e1aa1df45ad8a419bb794c4cf8ee1f24c42d9c8154b93b902

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