Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da535dc3d33e968…

MALICIOUS

PDF

102.7 KB Created: 2021-09-08 07:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7e2cddba155bc442efd23f1c4ba5c02 SHA-1: 5a86100ba7fd253582e2d942b21bcd1d3aaf082e SHA-256: 1da535dc3d33e968666de433580d30a99a48af3164ddf3c5cd20fe21e4071b47
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a large number of external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm to distribute phishing content or further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=morphological+classification+of+fungi+pdf PDF link annotation
    • http://ddservice-bmw.pl/userfiles/file/43343736076.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/46042163638.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea35142122---73235975928.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/vojemeximuxatigizopetis.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/zenuwumelupugukivujexuvo.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/f42729f768a7d5149ad57bc8e76b677c/77317763574.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a54c7676b---dolujiwa.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/77ecd4141716c019234ab1a7f88cc9c2/dupefekenusijakat.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/n2qr92898m2psadk3ma71p2311/niweji.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161057077db4de---dotoruravejozigamimiv.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a4187e440d8---mixoruji.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/21323512897.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16113c3ab97221---sijadapumuviribuwajumu.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/xewopuzapapekemividaxug.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/sevesezufigefomujutine.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/26989449991.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/winufedugoju.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/94197349181.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/78142806546.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c0a3edd19b751be61f71049b12c1875f/gezuxejinupulem.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/stb6k8lekt1iobedn8v51chjj0/52705247468.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cca0477d6---gosakufefunimu.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/24910229047.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/medawamogosi.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_off00012b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B67 18548 bytes
SHA-256: 00df8e003f4a8ab5eeb2b9385f6d2c222a271efc2e4c4dc86cd9263e84f0caff
font_01_sfnt_off00015bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E9 10860 bytes
SHA-256: ddeed88cacb2d2d6f478ad232dc7f1a36698513f4cf4010430bf6e3caec63eb7

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