Malicious PDF — malware analysis report

Static analysis result for SHA-256 580b5157a9bf7858…

MALICIOUS

PDF

76.3 KB Created: 2021-06-14 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 865c0205a3e450b258b2dbcaefcaf905 SHA-1: 6ace5fa573057b29d631b48f5dba1a709989b824 SHA-256: 580b5157a9bf7858dd3c6f6c6327746a430c4c0448b4a156b130bc1847080084
164 Risk Score

Malware Insights

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

The PDF file contains multiple external links, many of which point to compromised or disposable hosting domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure of downloading potentially unwanted or malicious content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=download+cuphead+full+version PDF link annotation
    • http://magooferta.pl/uploads/fck/file/sofopipi.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/12528659572.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc555198cf---ximaselobikixabilol.pdfIn PDF document text
    • http://rotang.net/userfiles/file/falikowavakopet.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/16405648170.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608771c357e93---zonogisa.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160816b131015b---47150641453.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1848793951609b5e807a8c5.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5ae17acf---66297321870.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5mb07ljrcrcn3msrb1tkagnis7/85352627088.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/2039171533.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd393de9e8---98649856728.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2sqjh5j6hsqcku6evntgk3nup1/zaropalobisozemugunafu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qk9amr1rt6m079tui06n5o1d7c/86944227552.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/55680519241.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/u6d6nv91hp9tfjcnj8j9nejt3k/12496825977.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5feb2eab407d71a322df07202c40568d/vugumo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pdh1joqsip338hulbd726efbjo/taxofute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 5392 bytes
SHA-256: 1cde68e4ee8483ea501313fa896e1c7e8fab64e7ea7075169c315713522bb857
font_01_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 10688 bytes
SHA-256: f845d6b43ccd6eb01eca906765b44a9d713f705a85d500be51e1448890b16d23

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