Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7c9ed32c9fb1b4…

MALICIOUS

PDF

77.8 KB Created: 2021-06-29 23:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6f7e88084ecbb0c7ae01f0cc4739c68e SHA-1: e049a3f685f2bec1fc010f84eac4fcdcf9b01635 SHA-256: 5b7c9ed32c9fb1b445fb45bed9301bb5d83b30d5ff2406bfbe2318b30ad38a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://manuscripthandler.com/userfiles/file/wexaxunumo.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e542c83d133cf74b454a9a5320c38820/gofadekovisodapuwo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d6f390ed3c5920ae4634df7f53f12ea2/33659877756.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dc5fd13ff---vamuresexizevisi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf5a7a29a---bosaxakux.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c690c8904ee---23332468850.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fcph961r5kp3o5vv18mncgvj3b/sezafawowawokutolagixigo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c4c708e579832c6bace37c1e7a7bd27f/mivisefim.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/64843224561.pdfIn PDF document text
    • http://effektfilm.de/files/file/jodik.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/63968927787.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/14130476784.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/12713221776.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/famafejukogimejum.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/taduzuxoxazifitufemu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1856c503fc---powagotabinor.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64c49bab8---tikomenokelobemazaxu.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210620_181942.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ij25ps8b1vhjsqm0vnlp31idl2/74072671062.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f32d130efdda833606365cd9112c61af/vesizaviluguwi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8dd2660f3de53dd159d8cb67017b6918/dulanemu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/dotareledes.pdfIn PDF document text
    • http://polletnv.be/uploads/files/39669899411.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c50691a0920---29076408053.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/mimevawirubowe.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/95774548954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+draw+a+rocket+for+kidsPDF 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_off0000cfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEA 16184 bytes
SHA-256: e0bc8b43f07a6987f3d8abc14124f0cb1277488997d3b985e0952a6b1dceb67b
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10488 bytes
SHA-256: b073df201f3e447a4c2aed4917a12fc576d68405bc4529584933b0c5b70e78f6
font_02_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1