Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf75fc37949e81dc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 12:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57aa53eb2eb8a9faadd74e3667e71afa SHA-1: 3addec465324c9c5c3615dfbbb9e227158c30197 SHA-256: bf75fc37949e81dc04968982bfef3a33fba4f8f6b1ac0760448a3c0f4aefd523
172 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a link farm pointing to multiple domains, many of which are compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sunarchegypt.com/userfiles/file/funikukeporevarukidawu.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368ef9cff5e---37673511617.pdfIn PDF document text
    • https://grnca.org/img/files/files/nokuliwapininaxedopamavo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3b26e249---pimet.pdfIn PDF document text
    • https://ksuskalology.com/images/file/15108466977.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557777c6f9---5477502474.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/jevakofav.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8br1uacp7fj99acb1j72goaef7/24539526423.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/lijirimemikalewegom.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/74376352525.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/68938364795.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/28212848335.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/motufimulunefetuzigomal.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021941410211014.pdfIn PDF document text
    • http://17njl.com/userfiles/files/pogoxuxitekuliwerelug.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/difusaratulofatogovakeb.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/60565877032.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zilagenodijulib.pdfIn PDF document text
    • http://www.grifin.sk/files/veterisanowot.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jekonoditajatexononogelox.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/newupomovilulewasor.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/59964677040.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/tusedivezunazax.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/15505327979.pdfIn PDF document text
    • http://dfanchem.com/upload/files/80494091582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=words+that+start+with+y+that+are+nicePDF 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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 10616 bytes
SHA-256: 8d6f84f024c91fac12f6773b6fad8fedfccbcbad4bfb57e86ca04b7fe3973106
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 17484 bytes
SHA-256: 7f1f79f37be2b0d1ab0310997401408885802b3be6a7b61f73afe31cd79add07
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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