Malicious PDF — malware analysis report

Static analysis result for SHA-256 109fc434d1b04327…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 23:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9057dc7dfacccce7e2da8f4a8f8938b SHA-1: 0c186910a3dc749061cc94267638c0f02ef69d39 SHA-256: 109fc434d1b043275b5820b4068787e027b20d98d1229901493ca8c722f6e838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The primary attack pattern involves luring users through these links, potentially leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=insidious+3+full+movie+online+free PDF link annotation
    • http://elmaryapi.com/ckfinder/userfiles/files/babaf.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/jenilof.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b8o8ooujbteg0ik7k59eq07h3l/jumukagifowadev.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/14213647869.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3ru0vnlnd6d4ih9b5uhchjp4vo/21921493084.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/acd498368dbaa102281c3a704a47c516/xibimijalaxamuwoze.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/zonivivovaxabiwetakatuwir.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e8d7c2c17---tifubanijugawabi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/539bb66b8277a194fdcdf1142b8a1438/jobazulajeniw.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8190953e13---fafesijakofuneka.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/dibomituxexekifer.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/nagunonogalebawedituse.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/sonamibasemizovelibosul.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/lunibunejesobojixerop.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a953eb14---35396773420.pdfIn PDF document text
    • http://midel.me/userfiles/file/50523406288.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e1c8de3ae4a0292399f66c0f0738b283/xujuxelolevek.pdfIn PDF document text
    • https://people11people.gr/uploads/File/daxeximosutamitok.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073688eca9b1---56131917666.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wuzewevases.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/784850f68ff520af2b333f053fc5b05a/saledokogezibenezatalimap.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/wipesixedobajep.pdfIn PDF document text
    • http://esistore.be/userfiles/file/19294764357.pdfIn PDF document text
    • 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_off0000b8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C4 16664 bytes
SHA-256: 9481936b85cd7c77dd61c0355078c720ff9c043db6179cad784504794ce6a1b2
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 10544 bytes
SHA-256: d894cb9e7e900ba14311e0ee00f706af6ae34f826d770f067732b0f1c1451bbc
font_02_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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