Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6dbcbf9627c6f76…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 17:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 67f40659de828943919e38300f8f158a SHA-1: 6b88b994b2bad7df0abc4ebff556a831cc8535d6 SHA-256: d6dbcbf9627c6f76879d1cb7f41e0ca0af15cf34e3f22c21ba68900e45924c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://vinacafe-dalat.com/Images_upload/files/nuvugobifapewafasinowiz.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/file/magufasatavewo.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/5595987165.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613880868c4f7---kafabimali.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/pekujuvemodoner.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/68522528023.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/76830507617.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/nesanerapes.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/74520026911.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f69e68d1a---75067580706.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/2146030263.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/63017077481.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h8qp4foh2q2picenulnadd8c2t/vibidigupisupobosewogalav.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/11535466417.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/saraliwaxusa.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631721314371613851.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/nuzetunawikatirawome.pdfIn PDF document text
    • https://cargobull.cz/res/file/53211430520.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337b7c3077d---82335978290.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/40011005011.pdfIn PDF document text
    • http://szpk.hu/_user/file/ralukexuz.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/496282896.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kuzabopazagolusenudoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wilhelm+baynes+i+ching+pdfPDF link annotation
    • 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_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 10996 bytes
SHA-256: dc58d68b64eba79e2965fc0281b5f3d3e17644a3849ef11fda55b50da32788fd
font_01_sfnt_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 18572 bytes
SHA-256: bb9c47db6726dc1229772bd40205e4e0b81c7fb58e7d086827321e73815541b7
font_02_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1