Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df015c0b4c94091…

MALICIOUS

PDF

91.9 KB Created: 2021-07-08 01:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e0d3f909a9d5e8ea622df9c4b827fdc3 SHA-1: 17a457d8ea4c4dc83ed88c71c81c38cb250374a9 SHA-256: 4df015c0b4c9409145d2ffb1da6da8edff453419c86a0fa68ee2cef8d1b9ae4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://inwebjor.ru/uplcv?utm_term=how+to+teleport+to+coordinates+in+minecraft+pe PDF link annotation
    • http://allycatering.com/userfiles/gonupafumosuzulode.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210705_210819.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/24589246178.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e9f8a56e40b04290884cd2fc537cf7a1/82666069608.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5a3ea87cf875e7ff8dc3cc61f267df0b/90690941878.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0dbc8ece---pemesexemenebaba.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bfa752d400ee888e082bcf02827907c/64535250398.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7f813662649b15adcefe555ac7df9788/81701672118.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/91494593438.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c959333774---vogavunuboba.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/de2d09480541f8f07b1b8d02727b2b9c/sekenirebiluvonowunur.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/djp6fnu0g9aj339b4epj8j92f7/zijezuforezipikenaxemik.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e43fd05e1---xasigowi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2fecfc79---boxubivabo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83175fd38---jovitovaturaxigorasadofu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501005120392120.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/359ec4fda8939a017ca48dbdac3da9e8/bumewudifokukodotavagoxef.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/11738102106.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160977669f311e---gixobozezukoluvubepu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608716316a41d---92048178933.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mejoguwadamiwo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3d1550d4---45100320808.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/bemoxexeb.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_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10860 bytes
SHA-256: af23c09407d711364417b6437629643f2f01e7bf7731d50d39083eb7f2a4e0eb
font_01_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 22840 bytes
SHA-256: b590fb32246169d017f0f40009d3970b8042c61d83da328d51aa36609ec40f8d
font_03_sfnt_off00014a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1