Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dd3596c586bc94…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 18:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2075f4b18dffb492d471b851b612fab SHA-1: f55ec9b24ddb4e512f4246666e1fe0eb744d1e41 SHA-256: 67dd3596c586bc94c9f8364a4dad7a1d93fa3b4296e4081a8f8ea544acb7b69d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate a 'link farm' pattern, suggesting the document's primary purpose is to redirect users to external malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/5d8f12056982694bee53fec463ef148b/38622568002.pdf In PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/sowapezowesimugutiti.pdfIn PDF document text
    • http://amandamaitland.com/images/file/gazitifesidexanafixugozo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbde03845f---pigetasonipemotuviwij.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/a9ec07376b528f9ea6aed628e4703cec/30809047511.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082a87a12a92---15107811524.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/lodisurinajaxexiliredo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa211fce1---sususazonefafelokowizuf.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/nunotetazazozur.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9ccd9484ff3db1dcfb1c7c64d36c966d/79268069220.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/wowimubazizotujimoxu.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/jixoxonejofuwitalujes.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/6804743374.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161325d24c929b---gulofevikeg.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d81d53cd409a2d4688c0aae1214d034d/paferevutozufez.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///manasolasofodemofodoruw.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124f009eaf0---vajozoderofewu.pdfIn PDF document text
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/miwuxamavine.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/68422306564.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/57166306233.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210824_8F7A4CFF4E8CBCE8.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/reninifepironejafumekede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lowercase+alphabet+letters+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_off0000cc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC65 10704 bytes
SHA-256: 4834575d7c0aa192b2fda584d3910067dec85a28664ad52fdb105d3314fecdae
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 17896 bytes
SHA-256: 48c1d8bc01991fc8bfe15f70f2c3b9824ad204aacf197e34827b6860185e2add
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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