Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f954217a8b0a1af…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 23:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd2c6b30cdd150249e1b22e418fd849b SHA-1: ae813d14732ec1f1574b8e52b27188f58bb5e38f SHA-256: 6f954217a8b0a1afd24c3933a3f06db05b510b5303ce6029586abc999abfa9f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to disposable or compromised hosting, suggesting a phishing or SEO poisoning attack. The presence of multiple distinct hosts and the use of 'utm_term' parameters further support this assessment.

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 http://paitoonbox.com/userfiles/files/pojosetuwidiwarikiseno.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/9778214323.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210726173638.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/mapamujavavopelunevom.pdfIn PDF document text
    • http://toonesk.com/upload/nokujakanitibosinafuseton.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/nuvariwobumuvakukitun.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/lavetaxiji.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/wolovavevun.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210628/1946488346.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/13cd0a53b83164fca7da067d1ebb5d8d/60699873753.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094902cd57c6---bafisarifef.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b433fcc18dc---dawutosulomifemefevi.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/52246118441.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/sefoxepara.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bead4877677---situbunekirugejeluwu.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/95927393163.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vusuxaxibinanatano.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/popofafid.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/vugelitirevawemebab.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/33203593860.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/litamo.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/wewejugakudej.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/7b08071361fa7c3f6e4487d755c35239/nuruzugujaxisolezix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=perikardium+adalah+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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 10464 bytes
SHA-256: fbaef76c804d691b09190d91ae9caf203e5ece4d38e4288317b5a2a4afa02840
font_02_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 16992 bytes
SHA-256: 6fccc99294993bd283b133b677b8fb3c1a8d688bd4994ff9e7ac91ceb8a5051a

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