Malicious PDF — malware analysis report

Static analysis result for SHA-256 a446bd53d4e30d0c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 10:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 461048d78afa1db8080b1f766b081eb8 SHA-1: e50a6ed25aa3c95521bc2fd3d671e987c8967f04 SHA-256: a446bd53d4e30d0ca6cbbc1c6c7ae03eabb147bc321fa029b5db653657ca7747
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious content through a chain of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8627129d8c5d206fa4100a2bdc19663a/nujoxumuwigazomoluxugi.pdf In PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/74515589172.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/wovafefudagekojo.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/46023078457.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/dkit7s8k94n6sdueommpln077p/1277883171.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7af4b44ef498b826308aba34d46c9c64/53348324694.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7ac1f21d---dunulu.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/xasajejobesanuseziriterev.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/vavunevufajesa.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b478a8402a3---lenivurul.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-16/20210816023333980286.pdfIn PDF document text
    • http://keacg.com/upload/files/gabadizisexomatuje.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/26600087107.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae3e77f8a---novupikotunu.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/lemudilumujerejidam.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609833d780c3b---polekat.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/vuzotalokepeniv.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c424c7c38f---755054190.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160918a40ba87b---dolofewetugitenamovaze.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a343167fd85---1277090200.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/954eef70b470aca5827c0a4bd4ffb038/46332255198.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/rejejapetowixinejov.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/32276585391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ain%27t+no+mountain+high+enough+piano+sheet+music+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_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 18296 bytes
SHA-256: a1d2003115076e64472de49ace75b136f8963816d548fe1ad2020ac77e2e82a1
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 11036 bytes
SHA-256: 9dd9fd9ed4875c79138cccf33b117c4cca3af5d903d8b290c5420b32b5ce98a6

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