Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f0f571fc36ba84…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 05:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55aa7b436f3b7bdf053e0b79b8a86e39 SHA-1: b8365c287384d8b83533cc9f6f5f03f3cbdc3b99 SHA-256: f1f0f571fc36ba8467ea194a317e7912b5b53eb49fbde99ab9f08acfe7d511b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cachnhietcacham.vn/Images_upload/files/sekuzodavizuf.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121970ad9eea---78054528244.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/29936374977.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20ea97913---garajijezafekodaveje.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/kukatupevuvamitogexep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100bae6eca0d---vusexeju.pdfIn PDF document text
    • http://www.bash.cl/media/file/ruvuvotoxavewiluwojuv.pdfIn PDF document text
    • http://ruresept.ru/files/file/60425617735.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2a49d5d116b9131c922ec0156b493a0a/lemaxizeban.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160872ff17b576---lasusotatunijuxejepuz.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/85518650015.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/lokukaniwazune.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/5545794521.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/67652172332.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/855f9ce66ef10d86a57e5845e3b3b6a9/miretatumosozesorowena.pdfIn PDF document text
    • http://polipack.ru/content/file/5803902789.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ce9f3f0e1787f3fe725026b73cfbcddb/vesuno.pdfIn PDF document text
    • http://sns.hu/_user/file/gepow.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d716275bc---memoxinuboginopatulozen.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/50072639932.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/98990743166.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/51411958781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=she%27s+always+a+woman+to+me+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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 17136 bytes
SHA-256: c1c48cabe6f96301173c77d745ef834577834f91b34502c741316a6d0941237e
font_01_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 11192 bytes
SHA-256: 1253c7854cc3af8ee2fd84eddde180ecb803bea04553ee48a5229cb320867cf9

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