Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3ec0ccbc59ff5b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-15 06:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35fb25837427058a7c748c4f34a712a5 SHA-1: 6c0e0c709838a5cfae8115f5098031df6b120c33 SHA-256: fb3ec0ccbc59ff5b6492045b7dc2cafd00e073676a621e41c99da72f36687aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. Although no scripts were directly extracted, the structure and embedded links suggest the PDF is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=mi+9t+android+system+battery+drain PDF link annotation
    • http://atrsara.ir/resource/files/xalegobipu.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/makiwenogulaginedobarazox.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/damidisid.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6tseg40b0hjrjceb241121dde1/punipalital.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/bosatodiderabulabegego.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wakezavebodinutolab.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/nokitozu.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/fipem.pdfIn PDF document text
    • https://austarpharma.com/upload/files/29101575028.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/xotuwesagebizi.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/66671674844.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/fizulasat.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2b40e444055ce08a17cf2d0cceeee7e8/vekofod.pdfIn PDF document text
    • http://capableapp.com/uploads/files/41056927064.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/lapebis.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/09bc032e09750bb12a2f363320554068/ranezexokimavadi.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/83485403477.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/17393867173.pdfIn PDF document text
    • http://aven.su/userfiles/file/37684975949.pdfIn PDF document text
    • http://c-six.it/userfiles/files/34554581803.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7ff4f25d---podirimuzaxomotu.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_247DB2272D012DAF.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210910043409.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/16313298343.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_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 18288 bytes
SHA-256: 78dfe8e2ff1bc2745521219f6fd799e48d78d5dc7500ba749f583978905478e0
font_01_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374A 10780 bytes
SHA-256: 3ef2ed297a3e4b12d5fc1b1136182c22dec56c6fa0eea87e5791e39045a23c67