Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf43cfac7e6b0b59…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 20:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c039fc373af155ba7806120771e16f5 SHA-1: c1a794c921c75700e738ac146ed23d65a777caad SHA-256: bf43cfac7e6b0b5961d809740ffae23d2915b043b460681ddcb0b5e523087daa
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a malicious link farm attack.

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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3368f3a364---gaxijujalifan.pdf In PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/859176872.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ca19a7f8348d6a5397a073c1ff5b7568/36232750136.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/17745340160.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/33018904366.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/mawexetarurakebojanudovok.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/324203c9e075edf476c720d961028430/8103038705.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/35117963271.pdfIn PDF document text
    • http://w-mill.jp/images/file/fokotamonulizixerazugoxu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611715d120ca4---93138477744.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/xilexogomabiz.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/12009295651.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/177a8a184ccbda7f54effd10f813b403/dojaginipetudubos.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/30524260776.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/1131690861.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/14c9c6dfad297baf7689b1de5e1f0a4d/doxokukuxevixik.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cu164p5puelj38r25dh00nmeaq/kedazorevomazez.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4hfvvon5comk0mn8jb8bb159ri/42265865111.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/bigutokefuxujozitix.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/92f07c846d391fa2749f4db0924416e0/68576164840.pdfIn PDF document text
    • https://goldenapp.net/file/loribowiw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bafexigazuvumatojizux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=quran+science+and+bible+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_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 10696 bytes
SHA-256: a5f08384a484950d0ed419abf5cd273be8ef153993d7aad73552b1ced7855aba
font_01_sfnt_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 17736 bytes
SHA-256: 91f1d9239c79cbe369ee09f23f778068e58b3cac755fbfb0dd97a82018ca3658
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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