Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b844e043da44599…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 21:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2a172798bebc5d636569c9a0adb6516 SHA-1: bdd3e05ac7ee9a193e8e3e268a1e8693173a7ece SHA-256: 3b844e043da445990b8e10da0e62adf67edb074cb910002a724c21b3afd25d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=khuda+hafiz+full+movie+download+filmywap PDF link annotation
    • http://kidzcastleschool.com/singhania/downloads/file/6826807073.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/sazevepivitumu.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/99088275616.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/41394722721.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/08vjhi7hs9loi6ghql7odrru91/palivememeso.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/37402600569.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/2735234276.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/33004869342.pdfIn PDF document text
    • http://baoveantam.org/upload/files/6068549347.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/bowijiw.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1db9afd48---19578368816.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/55808785442.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/veruniroxilarogufav.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/fomatam.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/sijoj.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/lufaxa.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/jigunemivakibidowevat.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/13061368705.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/21205967385.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3be989be4c95f0efe3aec9536d9727fe/pusojesumilexe.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/96821280904.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdef929ae7---8647019358.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_off0000b0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FE 17172 bytes
SHA-256: 253260073471cff205385b99ceb878b78b908b42879c92abf657c90d58d9bdfc
font_01_sfnt_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 10812 bytes
SHA-256: d36aa93a1e8559ba026a67d16b6beb91c30e5a4143b4d66abc52a23eeb6f25b8