Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bf0c2df9406c05…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 12:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a83c2e73008713eb5b7687b5ec7b7f22 SHA-1: 3e6136df63b82adc1c93924942fdacec5c1bdf61 SHA-256: b6bf0c2df9406c05acb5a8c429f9bb125656554528e120294073b23cba5e6566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users through these links, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=kindness+songs+for+kids PDF link annotation
    • http://eskuvoiiranytu.hu/blog/file/95271794295.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145a5048ab1c---meputexafawufa.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/mavudovunekefitazilawabax.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/debulowaxola.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130412d40bcd---xetijoxupo.pdfIn PDF document text
    • https://bursac.net/userfiles/file/52172364751.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/8051974879.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/nelowixumoliseworurunop.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1294305829613f24ec73ed1.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109132246506462.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4b38c77379e68f3494fff697af63d7a1/28090620489.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/kedit.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/bitunovivibiweteza.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133f6b6b9098---34738353294.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/xegedadalukipitujidif.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/57555615830.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7ff1e14d4f19e50eb3156887ba4d1b51/xuwogarukesutifotu.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/34598494099.pdfIn PDF document text
    • https://inijariku.ugdherbal.com/ckfinder/userfiles/files/mixumakisexudof.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/budopi.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/wuzesuvesogokisumusul.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/rozigoketefojip.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/7807851978.pdfIn PDF document text
    • https://linardi.ru/files/file/27133077195.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_off0000b21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA34 10304 bytes
SHA-256: 567fd0e0a4383d7c2c77b5b65b704acbc2016d012b3ac841f873420b77ae1608
font_02_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 15668 bytes
SHA-256: d96862f81cd03d4079a4cd2a2a94357999fbb18b05fc232395f9db8836cec8c3

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