Malicious PDF — malware analysis report

Static analysis result for SHA-256 9210953fe3b42271…

MALICIOUS

PDF

85.5 KB Created: 2021-07-13 23:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4e6e720a80c353c2b9b39039d233a4f SHA-1: c7ee6e063bc659b99cd05d00a95825a0076687d1 SHA-256: 9210953fe3b4227156da0a9425b705b68fff033c07f4c48407ed4ab7f921fcc4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing sensitive recovery secrets or private keys. Multiple URLs are present, some hosted on potentially compromised CMS upload directories, suggesting a distribution mechanism for this phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://jonesfamilygathering.com/clients/2/28/28a2af4908f4fae7f70f8b91082c1e08/File/nofijaxanatawaralatexi.pdf In PDF document text
    • https://rivaflo-south.in/userfiles/files/68943026393.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdbe601a2---pujurojupituzewaworo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c671a6a9b---vakimofema.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nelaxazada.pdfIn PDF document text
    • https://windsbs.biz/files/file/7341439402.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/24d6dd974675f04bf974814460d702e9/38690121008.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/1527065817.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/neloxezozinedovipobesubad.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/veretejuj.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9r23mkptmm1133oamaedi4lk62/42613124156.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/67810997524.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/tonekizuweliwunez.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/411d2f023a31e4ced428b3c64d1a8b3f/nuxejojizali.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d007118e9---96740246031.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/jikelitifel.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/157df09a4746d4a014af9eb6ad837b16/jidilawuj.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75a728b56a---golebik.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/417mh0vhd85hj52pvrssf3sk8k/guparuletitebobevavopi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dc0663052b3c7d67b807235c26267409/siviweroxuzanifeb.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb43bb70e6---runutiduwesezajijizezol.pdfIn PDF document text
    • https://aashianarealty.com/file/ponegizavimusijipuzedufoj.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4aed352e16edf1151b18fa97e082f9ba/xomubumapegozozugev.pdfIn PDF document text
    • http://mcutech.net/files/76839437030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+add+digital+signature+in+pdf+using+pdfbox+in+javaPDF 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_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 16536 bytes
SHA-256: 3ad9128461cd39db035d5e67741c276c93e47bd36aecf69fcf0ac97c7cfbaca3
font_01_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 11288 bytes
SHA-256: a07c7e87ac98f268cc97616a2796fee25564cac9c3e34b4383e825efff958bd4
font_02_sfnt_off00013072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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