Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b3258e1a61c672…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 15:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62fdb0ff6d7b75dac25d7f83922a5353 SHA-1: c0a3108c37581289e0ad412182ba0c9fd595ec83 SHA-256: 43b3258e1a61c67221b034889369867158a5d4237c0d105e7658cd4de8147be9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/hfclrg99qudfdgfi0qvosjpjkl/tozuperusuwu.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/baqv2e56gcgc05f95a8993kak0/65077942415.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/zirivasen.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210816133113.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/91b418e4a0e5949407dac23017975249/pujijugum.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/1266622679.pdfIn PDF document text
    • https://successalpha.team/upload/files/zotigonumap.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a48940367d0---79807259019.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1d48f01973656011fc5b1bdbf7b55ff4/62423669565.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce3af80ba6---lajiwukumobun.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/bf4e5fd7a4683f652e77fb9dd7ce3f62/gikaboxegalagaw.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/88037686204.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/31036712056.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4048bba559---24153941238.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/xewonegipabi.pdfIn PDF document text
    • https://digireg.com/upload/75055801324.pdfIn PDF document text
    • http://mousike.it/img_ins/files/tujolefotad.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/sanosuku.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/serufabopuweveg.pdfIn PDF document text
    • https://cmoretv.com/userfiles/zejowiw.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/22295732342.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/58194934457.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/72118404211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=architecture+concept+sketches+pdfPDF 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_off0000bfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 16324 bytes
SHA-256: 9ab24ee4937dafedbca59ff9cc124f8ad4d589353a52d96697ebf5e26c321d45
font_01_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 10680 bytes
SHA-256: b8bef9b5a8ebeda79b3090f5b1af01718284d00bb119bb8b8659af1c40b42ccf

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