Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d9c8890a965ba0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 00:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07d0f516b1b432d8f954267bd5ae9a6d SHA-1: 5147e0242483c98625376fe4f2ef1873babbab0f SHA-256: 72d9c8890a965ba000bb67ba8e92402e1a0734bc3e1f95f44f215dbd162071c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://newgoodluckcrane.com/admin/uploadfiles/file/lawidatunovanokakabetetak.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/33282bc245b0bff7a58134e7e167aefb/sasezaxig.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/706851793b421dac2ec8346cf82010f2/vaboderesinatusowaxabolu.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/bafikulagapakizam.pdfIn PDF document text
    • http://master-vin.ru/files/file/tavidasamisesojo.pdfIn PDF document text
    • http://anpharma.net/upload/files/93472294270.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/linor.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/pupemirapowapor.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/2263089210.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/77885969224.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/21369602288.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a8c6c80c5---23019829457.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/44b872ba5c55f1e63c1115cbbf167157/36253200206.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0c202f8d4---93522033757.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/fajexexe.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/zurarakak.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755f8e17e64---29481088305.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/3071851575.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/60689113933.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/nejowodusilunid.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mnnqvqi9ub53ue36hnmfokkj8r/woditawipelevod.pdfIn PDF document text
    • http://htwy.com/upload/file/88281069572.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/61976087794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+change+a+business+account+to+private+on+instagramPDF 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_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 15912 bytes
SHA-256: 36aa910e0cbb13c93d2faef9ea535447183f5d404e834b3b15c7f792fc41a2a6
font_01_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 11160 bytes
SHA-256: 98e47e6db49cc70733ecc9725774a12e6aedef0efee20b83637fa55f3d532b48

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