Malicious PDF — malware analysis report

Static analysis result for SHA-256 af39da560aea799c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 21:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 92578bcb0ac2f32cb1f7b6b14984cc76 SHA-1: 117aa6c675474112662056f69ca7c8c4ccaecfa8 SHA-256: af39da560aea799cd30390a62aba74d6bd24bf98b1e737284aa85ebe0b35c294
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this file is part of a phishing or malware distribution campaign.

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://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/97525ee7b758ebe0b5a418d334957ecb/72241186316.pdf In PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbe68e390---sezukopezurebenebadusamux.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a2bb6bb1---bolarosojatizow.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/dagufaboravomorisebaxobur.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/14464440714.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/29099777662.pdfIn PDF document text
    • https://longhoang.vn/upload/files/ferolijok.pdfIn PDF document text
    • https://artbynela.com/uploads/file/67316518480.pdfIn PDF document text
    • http://garderoba.sk/images/_file/3351284594.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7gthc4rjehakmqpvc59bhsv70/xewukugufudize.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f63c3a611f4d2aea34b0c539d11bddc1/6393552715.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/70988280659.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d44e828e2b395373d187276f15d65471/22719471672.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/77585113198.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/demomunaxipifob.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/5165fdce34c3e15ead0669ce27fb62bd/putajozorexejikev.pdfIn PDF document text
    • http://mq-water.net/upload/jefumanowofabofokelapapu.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/82375409313.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5bf4d19af---71789443698.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3e0bafcd---nifivawurulosewasog.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/sezozalerapokakufevo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0111b1f286---13903338967.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/59240482788.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/kijuzumowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=drawing+practice+for+child+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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 10820 bytes
SHA-256: 1bfd35117b16997293af93992797e83e83b7c7696bf5beb5eb2cc8586dd8bc98
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 17328 bytes
SHA-256: 28689e441dedfbb6af15d4a2f95cbd67d60dcc911acc112874c08095fe1bd0bc
font_02_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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