Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5bde7aaaed66c2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 17:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 097a82905bb50c4bebf13e18e1af9e39 SHA-1: 7a1eb322fd358c928fee51e814e00313d514707c SHA-256: bb5bde7aaaed66c23da2320846e924825d39bc53a0ac106e915f6de5aa8c7a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ieltsadd.ir/cache/fck_files/file/tuxesurut.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1430e47dd---woritobivelidekipuji.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/83546840499.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/4e28r71r88n6rb8r73fj5odkio/jeparolowonixo.pdfIn PDF document text
    • https://medius.sk/userfiles/file/57386297755.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/lobepa.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108031355025134.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0d442c5db2b1822d8b890914af400f71/japute.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf0ccd5dc---40087414106.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/fapopusojibodalizidaguwov.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2051b2cf45---5284720856.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c0e9e7f5---lupup.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/98110033518.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/puvofigibivamopipu.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/puzovikatifakorukijax.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/acd5c81fce4e03773b154e3da9a8ee1c/88476508496.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/lnqd8gok3rfl0colsts1klqnk3/71450770490.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/kozigabulakukataxadibul.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/sugojalanakapazab.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jvbg0v0r0ilqcabo4pmdiq03ul/kodemelopefeko.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071960620915---kudikijorera.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/60305581130.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/56057320898.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/kobisufonodiw.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/55191838793.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/59610268753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=canon+eos+6d+instruction+manualPDF 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_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10828 bytes
SHA-256: 4fb532e67876d9c3f7297a75b88f985e7308e51bd8207ff5de71d75c56a5716e
font_02_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 17692 bytes
SHA-256: f7a317985e45917f01ce0551eda9c6ba49b0bcae22b7d9747fa53bcd699b3327

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