Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aee15da4eb22797…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 16:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94ad5410696552f5a3eae5ddc0c3e881 SHA-1: 62353a776fcd8f352df268e31490bb8a2d8cd312 SHA-256: 3aee15da4eb22797e45c3009b7bf3ee8f4516cfc55c458cc44118a9697a92621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, with numerous URLs pointing to various domains, including compromised CMS uploads. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to lure users to potentially malicious content or phishing 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://highrise.pl/file/8130899526.pdf In PDF document text
    • https://melz-feu.ru/upload/60808396573.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/44356374590.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091004594160.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/64834528650.pdfIn PDF document text
    • http://parentini.it/userfiles/files/bemonixavuwozaviguveb.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/nexuto.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/98367156824.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161372919a29cc---sidenepaluxulurup.pdfIn PDF document text
    • https://schmitz.cz/res/file/49208862350.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/xaxunanuvonunozugele.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e027ef968---tewusutenenovexotozejivav.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/sazed.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///14272375335.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/82864909071.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/35623289881.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/wovul.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/363a6f755075fd9515aa3aa26fd0e3ca/pomujelokod.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/digedabaxasavusiji.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/zanujagewokopojojuve.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sekafitoziw.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/a0c383a0b0c40b4d972a2c1ea005be04.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b363de8d8546c421ff1820b74dc77b54/bokenokutuka.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/divelisaxiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=video+compressor+panda+apkPDF 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_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 17284 bytes
SHA-256: f29b4777c3de2da028a6d3989476ef339100eeb6e4089ce51c744b291da52c46
font_02_sfnt_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 10592 bytes
SHA-256: 68a4170d2b40ee4b848105b38d9de3965c55f7064a4a26a344245b22bfd8e08d