Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1e6ba9e27b96e8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 19:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7a21d43fcc5a50cb207d8ab9a944ec5d SHA-1: 4d7a695ad3d1074ff3c617df80332f15c15405d1 SHA-256: 7c1e6ba9e27b96e85f89adebb8b919e91d071e678f34fb3c36c1a53b171d4336
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://freetourscadiz.com/ckfinder/userfiles/files/19513978909.pdf In PDF document text
    • http://kopdesign.nl/userfiles/file/lanujaw.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/togisilopaxotizosomewi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b38104f63---modobifevaripoduviko.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/83636062619.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/61464582842.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e9a069feed738e8d60c2ae38cde3a4b7/foxedululegirotak.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d88f03dea---16895697601.pdfIn PDF document text
    • https://cmf8.ir/data/file/kidipezufozonisoz.pdfIn PDF document text
    • http://watch62.ru/files/files/16663369529.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/tadasijajupolezosuwim.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/78166376097.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/namavufezedomupufoz.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/dogofirowerajizeduzi.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/90130286960.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kodowutadawikejasatel.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/gewekujaj.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/10055785318.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/43907855825.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/pawugazovatibeta.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/95488946923.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/nugisepozobajemar.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/zurosesuzitepumijemidimup.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091322342998.pdfIn PDF document text
    • https://hsse.cl/files/xikilobaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=epic+heroes+war+premium+mod+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_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 17108 bytes
SHA-256: c87878789919f72663538ec13e804b7a8757b0b8e4617135a75ae4e11a26cc5f
font_01_sfnt_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 10792 bytes
SHA-256: 10130b63ea874305662d6f8a0b71d5f946584a94ce705cd2c64a7ebfd49e92e0
font_02_sfnt_off0001250b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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