Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d3f423c3bd15e6…

MALICIOUS

PDF

83.9 KB Created: 2021-10-06 21:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6ac52e50c2a076c7c9a05750022f4aba SHA-1: 78c5d46ba5e8c197a0652f8eae26872ebf77a320 SHA-256: b6d3f423c3bd15e6816cbb06387cdc1f2c07b48abde33af8a641b3494ae73c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=brother+pt+1250+manual PDF link annotation
    • http://mydreamtuscanwedding.com/editor_up/72914829190.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/35971299579.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/bosasimux.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/54975079788.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/85834329124.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/30261958460.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/mavuvowifolifenoxuz.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/60009491769.pdfIn PDF document text
    • http://saaretravel.ee/images/file/soketepiwi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da1ad36686---95127170957.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/88746503296.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/55a5ff7598b1bd84ae882ac40706e765/97086181163.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/fafurepurinevoda.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/86775253006.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/24407251944.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/90532647302.pdfIn PDF document text
    • http://webursitet.org/Files/file/56024005464.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/lagarurufapulofis.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c7575007a049530a3741622dc3194334/dajakeketomivaj.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1f15c93d2d9cfa3139648f78e9d9339e/35159644192.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/suduvawinuviwazuboxu.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/10962180200.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/51263459032.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/suvaloxirizeturaxomafasi.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/pedoxafufamikerolovemin.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/54064486100.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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 10840 bytes
SHA-256: 719a4f69a0294dbbf52572d7d97ff1812b3d68c1ee4cf9a8074f7ac989936214
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 20240 bytes
SHA-256: 7ada3cd89de774fdbc63cf282bfd2285915230bea1b5d15d7bd490ee1c6052b9