Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40d5b4db3322e79…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 04:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad9cf410c9c5c8b34aea0b2a0571e6f5 SHA-1: 3c67a925a6b6764d33c18e77a925d244527f7bcf SHA-256: d40d5b4db3322e79116f2f09720c0ae9b92a6ce3aff2388de00e649c90bbf372
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external resources, likely to download further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=iphone+settings+mms+messaging PDF link annotation
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/34787180603.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xodezokow.pdfIn PDF document text
    • https://sitarasign.ir/data/file/64088668536.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ae070d9aeba1b2e382d2145a51e11a54/sorarivabawatubipizix.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/tazuja.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fccaqlj4hfapknmj6rp7v1ea94/57875709117.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/binudebuwosijoji.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/kazubitalavu.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/morexunif.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/56300175324.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/ruvozalixevigapa.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/13682578101.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/zuwaw.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143236272a21---6108820785.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/benok.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/67803633345.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/72624642914.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210909123624.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/16889911631.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///sanedetu.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/84790751629.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/tenide.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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 10504 bytes
SHA-256: 0f8a7f9bae4338bbf72cbcc30f03b00e79c8c58263805d355a179a5b5454c2e0
font_01_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 19032 bytes
SHA-256: ee5c2ee27fd97bd5998fb53117493d7caf4d4036753617fd5367447685afcf6a
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1