Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e47f122f70c584…

MALICIOUS

PDF

95.6 KB Created: 2021-08-08 19:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 57d7d2bbd8baa3400b46a58388736ede SHA-1: d705b981f7b425c116f875303ad8421801270eef SHA-256: 13e47f122f70c584b58f12e29fd6f6d70af8142d1150cccb0b1bfbb513d2c4fc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=how+to+set+time+on+star+wars+accutime+watch PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0a074b167---duzobixumajevu.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/fizesifuneda.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bojubezifojalaxade.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/3031965824.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/87387b1a83c191d252ce4cf7783f754b/33241852787.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/mosolepanevuwolav.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b9daf031---47123845646.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/kadalunejazevubinas.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2e7971e2d013466e215f8816695b642b/fewexomuzawuwif.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/96369649461.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/fepudinolamafifoleg.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wavanativomapuguwo.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/kajuje.pdfIn PDF document text
    • https://profesa.net/userFilesfile/mujukajatorubozaxosoz.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/kuwiri.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b6cdeff4dd4dd687e5df67c20bc099f2/lomufezesiwuzipijiwo.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620366011.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609173c986032---74371180871.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4df909154---23971517787.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/46835653359.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a883da4f62d---12635585841.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/sasod.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_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 10628 bytes
SHA-256: fd403a396e68040c80756d32bde68a423e09cd30bdb9959b5eb426c62b60ddd4
font_02_sfnt_off00014180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14180 17008 bytes
SHA-256: 514698fcacc5d90f54daad6e84e9457097136402636d95261011de14a17f2fad

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