Malicious PDF — malware analysis report

Static analysis result for SHA-256 f115ca087ac2658b…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 02:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f1512a2e1064678a9af22b1082d293f SHA-1: 820659f178d5ab4933a1dc8feb294848a289f975 SHA-256: f115ca087ac2658b7a1fb160d578f30c392dc7c718052609b9c967c7028bcf2d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised or disposable infrastructure. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://businesslife.com/content/files/40913551728.pdf In PDF document text
    • http://mawaevents.com/uploads/file/98662092245.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kabalipap.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/82413134325.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/kumiluluxilazikuwusedudo.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/30591438002.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lekedikorovabejupajuzimog.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/gp2l9q3m6ol2b1hg9151q21p7g/rosakanabenatodu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c0ce25fd---35649625833.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/16202939379.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096369a27b7d---15996797372.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/vulonatoravasafewurog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d438b762390---xiveginapafedogifowemoke.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/21324017086.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/61478082628.pdfIn PDF document text
    • https://jurad.eu/files/file/vezufotovovaledasibozi.pdfIn PDF document text
    • https://davaocarrental.com/images/file/31270812984.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c97030ce784---nokadu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/136cb90a5287b2e352c0358e25c668c5/56562163907.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/eagriv8ilmdmuo7b4g6k9g6du3/92311658961.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/bd9310f063baa4efbc9e0e7cde9d9fda/50352544497.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/22327e3bbdbc21c4e4428c7e331d1909/kunulorinenimewozit.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/39308688914.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/ninomifekowamalorotetig.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liximinadusabozexaxaberi.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/bozum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+screen+mirror+on+sharp+tvPDF 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_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 17712 bytes
SHA-256: 1485f7649afa3003b16c479d3d1aaaf5c6f822d228a89af9b8b545b50584c520
font_01_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 10904 bytes
SHA-256: 3b0f25273d850f88ce1964c34b501b7c22cf50e7937284236f495b3c8ba867ce
font_02_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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