Malicious PDF — malware analysis report

Static analysis result for SHA-256 c984f6c37c1c4073…

MALICIOUS

PDF

77.7 KB Created: 2021-10-05 08:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ef9290008930410f025901f81b5627da SHA-1: e1220ec6dfea5ad1543a2c37ff89b97ac696c905 SHA-256: c984f6c37c1c4073fc2f27041409730e731224544c26bf4a1e9fe3e69425f32a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3i357bjemn6vmvbho6huj9ur10/fewunewevopeku.pdf In PDF document text
    • http://richardchong.com/userfiles/files/10243047944.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/10157621255.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147607a60c54---lawunafalepatija.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/lopuvilufulunufigal.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/digazogogumotipivuzef.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/74342277670.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/lawipufazoxeze.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/84689576712.pdfIn PDF document text
    • http://pmke.cz/pictures/files/62648420989.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/dofifawitizumaru.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/nijorexofuvefunit.pdfIn PDF document text
    • http://kd-council.com/upfile/files/35349685646.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/57929336378.pdfIn PDF document text
    • https://brukspec.pl/upload/file/sireke.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/tapajabemabakonididunalu.pdfIn PDF document text
    • http://okun.su/upload/file/32842932220.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/taxafa.pdfIn PDF document text
    • https://psicologopsicoterapeutaemdrtorino.it/uploads/file/33349656368.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/45649519161.pdfIn PDF document text
    • http://moristas.com/userfiles/files/81733386209.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/72020053765.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615bdbafb6e5b---zabimezumude.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/75535504483.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/zakowumasuviko.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/27245362925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=volume+of+the+right+circular+cylinderPDF 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_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 10936 bytes
SHA-256: 3acbb9c82505fe04b0262310c660367f39741bba83320116f7ce6ce2d5ee4402
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 18824 bytes
SHA-256: 61960f9610b212e954ecebdf5f8700165db7f16c7b23eb73db539183f8d011a3
font_02_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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