Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f925c561d2ff76d…

MALICIOUS

PDF

119.3 KB Created: 2021-08-14 18:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdab31dbce66239e919b17fd8d69c5a5 SHA-1: 98fc3d05d4f2ae4ef3e08e9a8853239b805e78a5 SHA-256: 4f925c561d2ff76da98383996c066756e6927bfadbaddb45266a545ac4e3923f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b1cdefc9bab0a418c9832d5447aa11ea/47908280956.pdf In PDF document text
    • https://scavilecis.it/userfiles/file/juseruzo.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/92013364421.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/99fc8f9edb251e1ec77e471c7d8afcce/76044966900.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/42dedd4456fb6dee2738ca1b6646b0c7/tejiwapeg.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/18215863962.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085b21361c79---28291682240.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/89675217099.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/45013260325.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///57372693529.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8301e7b82a2d83607b558fcc5a4cb944/fonujukuposiwodopilas.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/45234356800.pdfIn PDF document text
    • https://sinarwaja.com/account/files/nejupi.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/lazirebimeda.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/ravusufefekujumizuzosi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85c235bbf---sisarudopapopawevabuf.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/nidodasanubozagabuxiri.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vuwuduvuzusukekalu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bbb02b4e8eba1754d6ca9f98f576532/57920759558.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xesopok.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64bdb859c6---19242130453.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/62273254622.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hpjggqhlgm2ss66hokem9vqns1/8099899790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=makkar+ielts+speaking+jan+to+april+2020+pdf+download+with+answersPDF 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_off00016f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F34 17276 bytes
SHA-256: 4d8a3e93b503e9c5cd23f8b00d4a8e80593a682a719ea312557cc5e737a1c3a8
font_01_sfnt_off00019bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BEF 11320 bytes
SHA-256: b879a1900369bf3132c8fc5e04e2624a7a119361cc997d387e13736aad61d993
font_02_sfnt_off0001b662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.