Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d42e15fa20f0d1f…

MALICIOUS

PDF

94.0 KB Created: 2021-08-10 15:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b470a3220c2aae10c021c7287f2626cc SHA-1: 70c297ee92c7b7831c2b46027932f52f1da2dd2c SHA-256: 7d42e15fa20f0d1f3109b42dda600a61b635c78d0348af4ae40d5e8f14eb4fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The PDF structure and embedded URLs indicate an attempt to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://medvor.ru/uplcv?utm_term=if+empirical+relationship+between+mean+median+and+mode PDF link annotation
    • http://ghalemdi.com/userfiles/file/doduzozaxiboravufifivu.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/gojutusawosamike.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c639e750870---33195193345.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/76a7vadprri2f2qcq9e2l1ea55/26277576203.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/f1t0rtl7a23hnrvui0ncda4q0u/32015314650.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af925b1328b---36476395734.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/23242228281.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/fepudopexemenet.pdfIn PDF document text
    • https://okvino.it/file/fupazetisupa.pdfIn PDF document text
    • http://domplus.su/userfiles/files/wazuwipovokalus.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad40071cff---48219722138.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/6983325833.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5291d6f47a4d70e9555a5c5666c8dd92/84069761348.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088c05817061---veramidajezix.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610063ca553ae---59746227313.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/rubavag.pdfIn PDF document text
    • https://studiorampinelli.com/file/27789600400.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/mubuxoxekogokapo.pdfIn PDF document text
    • http://bamila.vn/luutru/files/ranudofuzimamizeju.pdfIn PDF document text
    • http://www.moyekolodin.com/files/dojaragesapabupowutibe.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/gaderip.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e2af2fc7fbf---63609227808.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d4312edcdb8e8539431d274fdc2bb674/82960140110.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 18300 bytes
SHA-256: 8a58b55f7b5e14b7536125baec8b909172086b5a94737cae8c1efc068d1d4c23
font_01_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off000137df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 11064 bytes
SHA-256: 639a4c8be3612af65f45cd9f0bc6c93659eb4be3584e9172fd8f546e1c586033
font_03_sfnt_off0001513b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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