Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e804457c7cf45f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 19:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c46c3ad325b44be285c817685c11bdd7 SHA-1: 7250708fffa4593edfa0d0d4483aa1543763559f SHA-256: a4e804457c7cf45f56e1e40dcad090f4f11218ffb51bd35cda58ea2739b89812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites to host files, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://homeshopeez.com/uploaded_files/userfiles/files/58312177676.pdf In PDF document text
    • https://mr-alian.com/upload/ckfinder/files/juranovujenata.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210922161047.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/vunitigafodaxafinoko.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/jaxuximevinufururo.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/61869743909.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a95d909c---zezivoniwiwumunaxobed.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/76922380050.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/vipofafuluruximatojoru.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109241050376269.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/wadasovijubovozuwarenirut.pdfIn PDF document text
    • http://4rrecycle.com/files/file/ruguvebeb.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/5322779088.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/75202389003.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/matopivaxefofiduvurijagut.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/84793302825.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/38658964865.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/84115842025.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/12747593773.pdfIn PDF document text
    • http://symbolfoods.com/files/file///didemuvivituleje.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/143dc5a79fbccdf170a489986a34a660/gelizitadibinepazi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/85364676888.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388110c6861---fomefixipajiwujegabugive.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/48179359738.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/50855166724.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/46975913873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=naruto+senki+2020+mod+apkPDF 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_off0000b53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53A 10920 bytes
SHA-256: ef773c97b5222c136faeb337d77e28fd29bad553528ad4c76b2bed3a2ac57dc0
font_01_sfnt_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 18100 bytes
SHA-256: 0f3cdbc0b14422969350bfdc005305101f0f04d4efdd824fbefde6fe60241a70
font_02_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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