Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7d3045c3023ad0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 19:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41ec62265739c81141d5688275ccb091 SHA-1: ac73e920e3c51fd152e547d9ade985ee10cd6eb5 SHA-256: 4b7d3045c3023ad053c033e602f5729595f9882c32c5e3f3e1d87a91d3add39a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised WordPress uploads or disposable hosting. This suggests the PDF is designed to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://infrive.ru/uplcv?utm_term=web+android+com+airdroid PDF link annotation
    • http://stisk.com/file/65081519294.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/38979177257.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/73638898677.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/94561675705.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/gogox.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906023152.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/masopuvojokajidi.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/47478621492.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9566b89c---xevijuvotopisugoni.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf79496e27---sogituwolap.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/85456868268.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/22550611186.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/razazuku.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4e980ae07bdc5b545a82bab188b61666/59299301730.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/xawowapiwatelebikemurowok.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/23885253873.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/35859425981.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/27130804715.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/21508344797.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/8842180051.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/jukatafopavodamujirewuj.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/9915652549.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/85715836468.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/26058771962.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210906225806.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA46 10352 bytes
SHA-256: 7a65947b7d2d3c5c359f202edb925166bb5f5716c8bf6ad5b0e14f8f144aaea1
font_01_sfnt_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 20872 bytes
SHA-256: cfd0e37c5c066c8e527a41ee743d904c5857fb88adf2f8ab29de88ee104983c5
font_02_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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