Malicious PDF — malware analysis report

Static analysis result for SHA-256 707b71e452f0dc2b…

MALICIOUS

PDF

87.2 KB Created: 2021-09-09 23:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4377429bdc4cedbabcac0ebcfc1b646 SHA-1: f9c7d41478c1f2b58b50769306408dd1cad960e4 SHA-256: 707b71e452f0dc2bb222b5d3cc5a9b0023b6c59f6f05475305b6719f68656f57
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is likely used to redirect the user to external URLs. The PDF also functions as a link farm, pointing to multiple domains, some of which are hosted on compromised WordPress sites, increasing the likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://nilsahost.com/calisma2/files/uploads/73622456560.pdf In PDF document text
    • http://reicar.dk/userfiles/file/dabegisodudujotuluwipuxe.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/67269176935.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/17707850498.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/85098477964.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134985895f93---rujupilugamok.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130111d87a28---62734122226.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/60406023506.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1de8f8fd---wukaselalito.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/18267826842.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/38264065205.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/soges.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c411b1dac---melisute.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/gexulufasutedavu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/wixitarudivukanakomebopi.pdfIn PDF document text
    • http://aminotp.com/upload/files/48154288796.pdfIn PDF document text
    • http://tecksco.com/upload/files/disotajaxizuri.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/34112343719.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/digadeginosekululi.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a1dc318f---totirux.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/gelomateduzamipabomugile.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/nokaxunepipokaji.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/pavewo.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/16580460492.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161376f67bde77---46228310074.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/21297161190.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/57078518256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+modded+games+for+androidPDF 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_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 16752 bytes
SHA-256: 9b33f1d4395a504e0870254faafa0481ce134f001dd8aaa736ed64a904ea0479
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 10532 bytes
SHA-256: 4aad4af9c18bc12aa4b9530ce5e18e35048aa295e8c206f20e1db9e00f66a216
font_02_sfnt_off000136c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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