Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba27de6e016f9992…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 00:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85a9f7ab26ffb4e74aa31572395648d3 SHA-1: 8cbce2ed8176626399b6df4a2fe0af313533068b SHA-256: ba27de6e016f9992368dd44b82be6651bcdf6f48bac8a5d8d2b83fb20abd9844
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=modern+biology+textbook+online PDF link annotation
    • http://urotunisia.com/uploads/FCK_files/file/67381676152.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/sagelovokerupavu.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109120152413768.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161363d54623b4---kobujinajid.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/leranozuwufijemuk.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/zomabivopono.pdfIn PDF document text
    • http://wamer.org/userfiles/file/27421481351.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341c620fdc5---87460109834.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/82044698394.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161478af97ba1b---61994831256.pdfIn PDF document text
    • http://merwepizza.com/upload/file/96882363476.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/gimog.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/sajepuginogido.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/19776141423.pdfIn PDF document text
    • https://timminsrenovations.ca/file/w6q8zX8kolwHgNKC.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/20813606179.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kejazalapubot.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57696905810.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/diwimovifidi.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/xavopan.pdfIn PDF document text
    • http://smirna.pl/files/file/26893616693.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/67148730285.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/wagikovegisudido.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/17198499747.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/41856928878.pdfIn PDF document text
    • 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_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 10536 bytes
SHA-256: cd7a21fd4b907a780a0dc1b0015c774145c24168f0af84fb03497b982fa3ce49
font_01_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 16980 bytes
SHA-256: 02e013780d01bf0a799c1bc3c603a009db93c2e79a367393556bc9d01fbd547c
font_02_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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