Malicious PDF — malware analysis report

Static analysis result for SHA-256 9394946647c179ea…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 20:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 619a902475faba567596de4ef8a1115c SHA-1: ecd41fca0d4dd5368c7bbd59a63697965a31b86f SHA-256: 9394946647c179eacc65563744f083c711bdef79ddfac31c8e55eff3dad75302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS upload storage. This pattern is indicative of phishing or malware distribution, aiming to lure victims to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1tap38k3pkcv5k7ctogs7ffd3l/paruruxagu.pdf In PDF document text
    • http://teifsepahan.com/files/file/zevigojo.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca85a88269---sonanogomatos.pdfIn PDF document text
    • https://777mto.com/contents//files/17168760376.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/60760881053.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/movaselaxagidafizizukuvuw.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/pamomukekowuj.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e530d3726---sunoreb.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i48c6j16gr8hor1aentb389hah/gesezafojup.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/jileneb.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/42996132782.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/mogajepedejitarokorivam.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/33141344749.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/72420571770.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/jakogewabuwas.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8eb9d4e33---21503627332.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/rokebef.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/88040688725.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d17dea311f922805992cd197518ab461/42884358544.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/98661406893.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/57921807523.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b918bbc8d10---61179771368.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/71681118684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=uriel%E2%80%99s+machine+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_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 18484 bytes
SHA-256: 84cb3a87275583120fc2865d3a6c4d14a09d489a8850dd829b6fc19d12025dfa
font_01_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 10724 bytes
SHA-256: 819758772f7f7c3e76c471353e3800940c9090f0208eabed694848898c1f6691