Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb65f79e6b934e0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 17:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e40a735754d1347cb7e5c48e41df3f31 SHA-1: 3b7ecff7396d526c6d53adc18ea1496ce64ebdb8 SHA-256: 1eb65f79e6b934e0782dffb532d148bf703b5e7ddb5d4ef7b497e06bf99fcfc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=variedades+de+cafe+en+el+mundo+pdf PDF link annotation
    • http://splogservice.ru/content/file/babar.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/c23b17674698764cbb2ca15dccc93245/vilowipisazivib.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac3436a212---77421054001.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/d775mdlf2h9cjigcda6hr4cfr2/8745135508.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/87209703022.pdfIn PDF document text
    • http://vitrine-prof.com/files/50617604577.pdfIn PDF document text
    • https://citytrafik.nu/images/file/68503600933.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef2ddf1e88---90474857635.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/45671268147.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/3659636266.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/74338389997.pdfIn PDF document text
    • https://equalland.com/uploads/File/85229857106.pdfIn PDF document text
    • http://ramz-alqassim.com/Files/files/lomipizekimipomo.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/90408643876.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/jubumogenuduxaponomimeb.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e6093fc2f1d4f17fdf339e809e780d56/tutuxevep.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/95208839089.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/zegilomikevamov.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/57912977793.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/vigeneginitobumoraw.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/15643295771.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a178177b765---15541481829.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/31835733652.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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 10752 bytes
SHA-256: a63a226697993031c4f8cf2c198a8b4823c7e2457b630974e8664aca5f76d1b7
font_02_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 19252 bytes
SHA-256: a279b469081c284474c327b4883f9a648066e0a4728bd7015f57576486c79b4b

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