Malicious PDF — malware analysis report

Static analysis result for SHA-256 231318932b5b130d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 06:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69c2d4015e0272d7a9ffe2eb8820427d SHA-1: 23c427213b39f26ca414f32993c0e70546698cef SHA-256: 231318932b5b130df7ba9b1d39cd3c4e80925970bb54974882365e5a007bc960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a malicious intent to distribute further content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.corazondelsol.es/ckfinder/userfiles/files/81595521361.pdf In PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/ribegesasu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/61148099722.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/58435549951.pdfIn PDF document text
    • https://area5srl.it/file/sivodebodizedubidulexap.pdfIn PDF document text
    • http://spiregene.com/image/files/20210731_060158.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/lirezasukadezowekumerisat.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/dogefali.pdfIn PDF document text
    • http://ktcz.eu/files/files/47307878421.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/43398847206.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/50897658322.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7656f12ba---81508465938.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/9256007031.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c408aee2---povitotixamo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca6b76fd42---zufurusukil.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jegeza.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9nlqdruatq89aa1oeeqq3rdm1t/98144222665.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4a3fcbeb25e268da0554ca3f4585d4db/kamenoxevagexizageju.pdfIn PDF document text
    • http://15881588.com/ckupload/files/laribobavukigeta.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b8087df08233ecbd14e74b6b56d989a6/20516853127.pdfIn PDF document text
    • http://synowka.pl/galeria/file/febezujuk.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/5s0797j0pqakg3qfm4fd6usr32/tuvewotikejagarodove.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/lufuwigalaxowok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=marketing+data+analysis+pdfPDF 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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 10752 bytes
SHA-256: fe0c6fc4a842dccc764d374b14455aa8ffb963c2ccbd5daddfaa1c89638bcddf
font_02_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 16344 bytes
SHA-256: 3305dafd557757b9c8ed7ba9ebe0ae78c1ede8eaec482efa15dea99731e94e2e

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