Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f0ff8db1ad0ecf…

MALICIOUS

PDF

119.3 KB Created: 2021-06-30 01:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38d35f06857e9a1901a0d9e58da39910 SHA-1: 8a0f70b92e29829f5005497056397aa72a81a67b SHA-256: 88f0ff8db1ad0ecf250ca9350a061ed1c64e7e4902a53b0cb1fe66f2b7d1d2b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document, detected as a phishing trojan by ClamAV and ML classifiers, contains numerous links to external websites hosted on compromised CMS platforms. The document body is heavily obfuscated, but the presence of multiple links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware. The use of a link farm on disposable hosting and compromised WordPress uploads indicates a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173a66c11e---mavenabut.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ac2f39e7370f7b8e2b30aea175b9456b/levebafixikuzupekotuvenix.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/168aa8b07ddd6ff22c888898a66ed781/wimego.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/95700511238.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e9d67bfa---tajugiridinor.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073e730ccda9---41662647462.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092890d12096---76001830675.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3c98b5a7---300517336.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d239a703532---53200321623.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/8ace2b43404005b19eb662b5e9315664/929783696.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/53448896736.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608371d83d71d---punikigowoj.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05f983369a---juzaroxo.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/6914517900.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621650726.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160704f9eae85c---zemisuzoraw.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb60f26804---3873820019.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092d5aba85f3---dulaluziw.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/7057764436.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/80837107662.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/28016035176.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ae61391b7f6a9024309b1893e4df2d3e/xujizivu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabb4a3a6d---41656715271.pdfPDF link annotation
    • https://signika.pl/Upload/file/64972034606.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/70506422b23d056d65000f4dd6722dd4/88915725486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=waste+management+policy+examplePDF 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_off0001733f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1733F 16660 bytes
SHA-256: b99156769b2f84b5b39b9ca12cbaec12d7e88980270c3792f97323e03a86fe3e
font_01_sfnt_off00019e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B63F 10824 bytes
SHA-256: 63774b16d64054092cbb8392fb2f1b58ae6b1c84110acffd95ce28678067432f

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