Malicious PDF — malware analysis report

Static analysis result for SHA-256 efde93d89227951d…

MALICIOUS

PDF

92.5 KB Created: 2021-09-14 05:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60aa1691419c776481aa4c52b120097f SHA-1: 6a7bc202221b89493ca8dddb1638d2f5d060d991 SHA-256: efde93d89227951d8b04af63dbb94d7d768a0459d460b0c152a08f7f424f0c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://netiko.ge/img/Data/file/85277432289.pdf In PDF document text
    • http://elcivan.com/admin/UserFiles/file/pigolol.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/30096485051.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090515502773499.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/71886643632.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j8pog2rcifbukjaf92qsqovu1f/fofarakusapibamenujawubu.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/94446030018.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/30397300974.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/xadikirulim.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613305265c2eb---norepir.pdfIn PDF document text
    • http://mlead.net/images/e/file/90269090256.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/96718061093.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbcf7b85a---toritotok.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/34821368359.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/pegeduwe.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/vafabelax.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/1611226346.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/binonolosuxodimujumage.pdfIn PDF document text
    • http://foxadv.net/file/geruwivepede.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/48324914088.pdfIn PDF document text
    • https://digireg.nz/upload/68406306111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kurulus+osman+episode+1+english+subtitlesPDF 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_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 11124 bytes
SHA-256: 5f7e1b94f0867927fd1b9c86b35a62ae50267daaa1ce9c062d4cd23eb32004bb
font_01_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B7 19272 bytes
SHA-256: 6a30bc6fb14ae131e1138d4c200da431f509c267edfa8c9e1bdf0cf77154a20d