Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b15b17c763c1676…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 17:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0625a1fe365f6c6de054852894543765 SHA-1: 7e21bd3babda6c81174dd0357591924b6e392ae9 SHA-256: 0b15b17c763c1676c360f0822224e6758075f21f4873693b16a222732d06d054
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to disposable hosting, indicative of a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://moderncarrent.com/user_img/files/58935693800.pdf In PDF document text
    • http://wib24-admin.de/uploads/file/tezilewefenimanonupava.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/15096868576.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459e319f1d1---48752459844.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/89313932426.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/50778131445.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/reluvogoregig.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352bf56f8a5---duwiwodiwisawazuxivi.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/doparuzexikaxunepa.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/moruvubapuwedugowuf.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/79374174714.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/baruvikupip.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/52888639699.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/gomepe.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/6242146475.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/57341693877.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/mesupakudasa.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/limigisali.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480a3014d0b---31763864297.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/javotanomawejabelewid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=five+love+languages+gary+chapman+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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 11224 bytes
SHA-256: 00db0c67b09be80e961181d6c6457441fe605b595ce83e2c8b81029860b357c6
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 18120 bytes
SHA-256: a7fd83471cc292f4bbf7c4054b5b53864933a69bbf0963668fbe82acf0a6d86a