Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7e55fddfefeab7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 10:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13a41e90d5f002214a8b797408edaca7 SHA-1: 68f79b02126a6bf32070f6fc8045c11b94fa8e54 SHA-256: 5d7e55fddfefeab775602a4f29f9180f6a9b2248c40dbe22267c009d01383c94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://haphadoor.com/upload/files/ribomotu.pdf In PDF document text
    • https://firesystem.ro/imagini_ws/xoxufi.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/56218129904.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/36895279944.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/41566a8c28e487aaf39b3376032486f3/7799421843.pdfIn PDF document text
    • http://dzbnf.com/upload/file///47340897124.pdfIn PDF document text
    • https://digireg.it/upload/dajuzid.pdfIn PDF document text
    • https://bataretak.com/img/files/file/80926910890.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3a7997301436e8cb1b4944da668a41b2/pokaduzepuxelawo.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/gimexesewafevudobilove.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/76711126227.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/42750588344.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c761884ee5---xiviladaz.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9b5e69ae23ce95b877a48133c8348a5e/pijokizujimu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e7a16925066851b78f4cdd4aacf43b6c/pizabukopiterudur.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/biron.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/minatixivusebewefofomeb.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/vajeteziso.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901de0b2db6---75607184027.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/jawabiwalar.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/fojarujedofavore.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/998e32013504dbb784f3fd2cce592ca1/govixukarufirasug.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/544d5871dcb7a9263ef4370deaaee2b9/zakogo.pdfIn PDF document text
    • https://schmitz.cz/res/file/romig.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/pokikevejubivafegibatix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=combine+multiple+pdfs+into+one+foxit+readerPDF 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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 20052 bytes
SHA-256: 927fc94d66dcb515173c67d2f928fc68b6ab7d95b1ca69f9e04875c3550a444a
font_01_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 11032 bytes
SHA-256: 2b8efae3dace78636e6087657e68b26ad9978849aea356a06d026bb17466df17

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