Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb2443a57513855…

MALICIOUS

PDF

82.3 KB Created: 2021-08-12 03:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 80248fac61b115fa8ec9fe93f022abf7 SHA-1: 4d74e4c8c4394e4edcd42600efc29974cd60fc61 SHA-256: 5bb2443a575138555455a6ab215e7a8a0ccb8e108647e3bb34b10b6a2d96f4e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://iveducentar.com/uploads/assets/file/82994755177.pdf In PDF document text
    • https://elesud.it/img_pagine/file/gupig.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pixex.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/70417123194.pdfIn PDF document text
    • http://vo23.ru/upload/file/11312721876.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/bdf7aa4c52511f4de80e8e9928f45f5b/kivev.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/72522872808.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a7936f80c94fb5dcf7c150d5a5c28a4f/56616868105.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/vudutu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2073606f7d---69620582118.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/91894250064.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6890be32a2---fatalexejomotamivorewu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/76fea5154c59fbf5e06b85044810789b/sosabulul.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/97328753219.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/877d9e4977d4dde583179dd0ec0fc8ef/zivudumotadeki.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0368dc3e4fb161d1a5372bc96bfbde68/12811716150.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/giwipotilite.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jubibojisegajexok.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/53887438014.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5cebffbf---1850148549.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/6835788230.pdfIn PDF document text
    • http://melvin.cz/data/karud.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce01f41382---17660350354.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/fufarinamaw.pdfIn PDF document text
    • https://agatanorek.com/files/file/59815587117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ebook+belajar+bahasa+mandarin+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 16168 bytes
SHA-256: aedeebd228771a82da3619471a975f699e996bf2eac86536f6786df9196e9d5a
font_02_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 11008 bytes
SHA-256: c0250c2d54fa9e407cf815b6ae99cfdd3fb378768c2f3939aa1c941f8c9a2031
font_03_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 2056 bytes
SHA-256: 58db96b58d1b2f0eb6334153619ff7cead547fcf4eaa56b67ff736357993ea97

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